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[Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/ "Vulnerabilities") [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) # Unit 42 Discovers 15 New Vulnerabilities Across Microsoft, Adobe and Apple Products ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read Related Products [![Advanced Threat Prevention icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced Threat Prevention](https://unit42.paloaltonetworks.com/product-category/advanced-threat-prevention/ "Advanced Threat Prevention")[![Advanced WildFire icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced WildFire](https://unit42.paloaltonetworks.com/product-category/advanced-wildfire/ "Advanced WildFire")[![Cortex XDR 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Mastodon") ## Executive Summary Unit 42 researchers have been credited with discovering 15 new vulnerabilities addressed by the [Microsoft Security Response Center (MSRC)](https://portal.msrc.microsoft.com/en-us/security-guidance/acknowledgments), [Adobe Security Bulletin](https://helpx.adobe.com/security/products/acrobat/apsb21-09.html) and [Apple Security Updates](https://support.apple.com/en-us/HT212011), as part of the last quarter of security update releases. ## Vulnerabilities Of the 15 new vulnerabilities credited to Unit 42 researchers, 10 come from Microsoft with severity ratings from low to important. The four Adobe Reader DC vulnerabilities are all critical bugs that allow remote code execution (RCE). Lastly, there is an Apple cross site scripting (XSS) vulnerability that could also lead to arbitrary RCE in the context of the currently logged in user. The Unit 42 researchers credited are Tao Yan, Zhibin Zhang, Bo Qu, Ronen Haber and Ken Hsu. The recently discovered vulnerabilities are listed in Table 1 below: |------------|---------------------------------------------------------------------------------|---------------------------------------------------------------------------------------|------------------------|-----------------------| | **Vendor** | **CVE** | **Description** | **Type** | **Researcher(s)** | | Microsoft | [CVE-2020-16876](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16876) | Windows Application Compatibility Client Library Elevation of Privilege Vulnerability | Privilege Escalation | Tao Yan | | Microsoft | [CVE-2020-16895](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16895) | Windows Error Reporting Manager Elevation of Privilege Vulnerability | Privilege Escalation | Tao Yan | | Microsoft | [CVE-2020-16924](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16924) | Jet Database Engine Remote Code Execution Vulnerability | Remote Code Execution | Zhibin Zhang | | Microsoft | [CVE-2020-17007](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17007) | Windows Error Reporting Elevation of Privilege Vulnerability | Privilege Escalation | Tao Yan | | Microsoft | [CVE-2020-17046](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17046) | Windows Error Reporting Denial of Service Vulnerability | Denial of Service | Tao Yan | | Microsoft | [CVE-2020-17062](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17062) | Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability | Remote Code Execution | Zhibin Zhang | | Microsoft | [CVE-2020-17094](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17094) | Windows Error Reporting Information Disclosure Vulnerability | Information Disclosure | Tao Yan, Bo Qu | | Microsoft | [CVE-2020-17138](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17138) | Windows Error Reporting Information Disclosure Vulnerability | Information Disclosure | Tao Yan | | Apple | [CVE-2020-10012](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10012) | Quick Look Cross Site Scripting Vulnerability | Cross Site Script | Bo Qu | | Microsoft | [CVE-2021-1703](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1703) | Windows Event Logging Service Elevation of Privilege Vulnerability | Privilege Escalation | Ronen Haber | | Microsoft | [CVE-2021-1711](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1711) | Microsoft Office Remote Code Execution Vulnerability | Remote Code Execution | Tao Yan, Bo Qu | | Adobe | [CVE-2021-21058](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21058) | Adobe Reader DC Memory Corruption Vulnerability | Remote Code Execution | Ken Hsu | | Adobe | [CVE-2021-21059](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21059) | Adobe Reader DC Memory Corruption Vulnerability | Remote Code Execution | Ken Hsu | | Adobe | [CVE-2021-21062](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21062) | Adobe Reader DC Memory Corruption Vulnerability | Remote Code Execution | Ken Hsu, Bo Qu | | Adobe | [CVE-2021-21063](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21063) | Adobe Reader DC Memory Corruption Vulnerability | Remote Code Execution | Ken Hsu, Zhibin Zhang | ^*Table 1. List of vulnerabilities.*^ Specifically, the patch of CVE-2021-1711 addresses a new type of security issue that Unit 42 researchers discovered. Tao Yan, Qi Deng and Bo Qu will share more technical details at [Black Hat Asia 2021](https://www.blackhat.com/asia-21/briefings/schedule/index.html#give-me-a-sql-injection-i-shall-pwn-iis-and-sql-server-22251). ## Conclusion Palo Alto Networks [Next-Generation Firewall](https://www.paloaltonetworks.com/network-security/next-generation-firewall) customers deploying a [Threat Prevention](https://www.paloaltonetworks.com/products/secure-the-network/subscriptions/threat-prevention) security subscription, which includes capabilities such as vulnerability protection with an intrusion prevention system (IPS), are protected from zero-day vulnerabilities such as these. The [WildFire](https://www.paloaltonetworks.com/products/secure-the-network/wildfire) security subscription provides our customers with comprehensive protection and automatic updates against previously unknown threats. Weaponized exploits for these vulnerabilities are prevented by [Cortex XDR's](https://www.paloaltonetworks.com/cortex/cortex-xdr) multi-layered exploit prevention capabilities. Palo Alto Networks is a regular contributor to vulnerability research in Microsoft, Adobe, Apple, Google Android and other ecosystems, with more than 300 critical vulnerabilities discovered. Our researchers give regular talks at security conferences such as Black Hat, Blue Hat and REcon. By proactively identifying these vulnerabilities, developing protections for our customers and sharing the information with the security community, we are removing weapons used by attackers to threaten users and compromise enterprise, government and service provider networks. Back to top ### Tags * [Adobe](https://unit42.paloaltonetworks.com/tag/adobe/ "Adobe") * [Apple](https://unit42.paloaltonetworks.com/tag/apple/ "Apple") * [Black Hat](https://unit42.paloaltonetworks.com/tag/black-hat/ "Black Hat") * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/ "Microsoft") * [Microsoft Security Response Center (MSRC)](https://unit42.paloaltonetworks.com/tag/microsoft-security-response-center-msrc/ "Microsoft Security Response Center (MSRC)") * [MSRC](https://unit42.paloaltonetworks.com/tag/msrc/ "MSRC") * [Privilege escalation](https://unit42.paloaltonetworks.com/tag/privilege-escalation/ "privilege escalation") * [Remote Code Execution](https://unit42.paloaltonetworks.com/tag/remote-code-execution/ "Remote Code Execution") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Satori: Mirai Botnet Variant Targeting Vantage Velocity Field Unit RCE Vulnerability](https://unit42.paloaltonetworks.com/satori-mirai-botnet-variant-targeting-vantage-velocity-field-unit-rce-vulnerability/ "Satori: Mirai Botnet Variant Targeting Vantage Velocity Field Unit RCE Vulnerability") ### Table of Contents * ### Related Articles * [Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy](https://unit42.paloaltonetworks.com/siemens-rox-ii-zero-day-vulnerabilities/ "article - table of contents") * [How We Added WebAuthn to a Browser-Based RDP Client](https://unit42.paloaltonetworks.com/webauthn-added-to-browser-based-rdp/ "article - table of contents") * [The Global Namespace Risk: Universal Bucket Hijacking Technique for Cloud Data Exfiltration](https://unit42.paloaltonetworks.com/cloud-bucket-hijacking-risks/ "article - table of contents") ## Related Vulnerabilities Resources ![Pictorial representation of a group of people interacting with a dynamic 3D holographic display of colorful, undulating data waves on a table.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/09/11_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) August 4, 2026 [#### The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [Frontier AI](https://unit42.paloaltonetworks.com/tag/frontier-ai/ "Frontier AI") * [Vulnerability Exploitation](https://unit42.paloaltonetworks.com/tag/vulnerability-exploitation/ "Vulnerability Exploitation") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/frontier-ai-vulnerability-burst/ "The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software") ![Pictorial representation of AI-enabled autonomous cyberattacks. A digital illustration depicting abstract, interconnected data streams in vibrant colors on a dark blue background](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/07/AdobeStock_992950050-3-782x440.jpeg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) July 30, 2026 [#### Chinese-Speaking Threat Actor Harnesses AI Models for Autonomous Cyberattacks](https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/) * [ChatGPT](https://unit42.paloaltonetworks.com/tag/chatgpt/ "ChatGPT") * [Claude code](https://unit42.paloaltonetworks.com/tag/claude-code/ "Claude code") * [CVEs](https://unit42.paloaltonetworks.com/tag/cves/ "CVEs") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/ "Chinese-Speaking Threat Actor Harnesses AI Models for Autonomous Cyberattacks") ![Pictorial representation of three zero-day vulnerabilities in Siemens ROX II OT switches. Digital illustration of a global network featuring interconnected lines and nodes over a map of the world, highlighted with neon lights and digital elements.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/07/03_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) July 17, 2026 [#### Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy](https://unit42.paloaltonetworks.com/siemens-rox-ii-zero-day-vulnerabilities/) * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2025-40947](https://unit42.paloaltonetworks.com/tag/cve-2025-40947/ "CVE-2025-40947") * [CVE-2025-40948](https://unit42.paloaltonetworks.com/tag/cve-2025-40948/ "CVE-2025-40948") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/siemens-rox-ii-zero-day-vulnerabilities/ "Three Steps to the Terminal: A Siemens ROX II Zero-Day Trilogy") ![Pictorial representation of PAN-OS CVE-2026-0257. A vibrant city skyline at night, with tall skyscrapers and glowing digital beams extending into the sky, suggesting advanced technology and connectivity.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/06/07_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) June 9, 2026 [#### Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257](https://unit42.paloaltonetworks.com/active-exploitation-of-pan-os-cve-2026-0257/) * [CVE-2026-0257](https://unit42.paloaltonetworks.com/tag/cve-2026-0257/ "CVE-2026-0257") * [Vulnerability](https://unit42.paloaltonetworks.com/tag/vulnerability/ "vulnerability") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/active-exploitation-of-pan-os-cve-2026-0257/ "Threat Brief: Active Exploitation of PAN-OS CVE-2026-0257") ![Pictorial representation of CVE-2026-30300. Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/06_Vulnerabilities_1920x900-3-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 6, 2026 [#### Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/) * [CVE-2026-0300](https://unit42.paloaltonetworks.com/tag/cve-2026-0300/ "CVE-2026-0300") * [EarthWorm](https://unit42.paloaltonetworks.com/tag/earthworm/ "EarthWorm") * [PAN-OS](https://unit42.paloaltonetworks.com/tag/pan-os/ "PAN-OS") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution") ![Pictorial representation of a severe Linux vulnerability. Close-up of a woman wearing glasses and focusing intently on a computer screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/05_Vulnerabilities_1920x900-2-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 5, 2026 [#### Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/) * [Containers](https://unit42.paloaltonetworks.com/tag/containers/ "Containers") * [CVE-2026-31431](https://unit42.paloaltonetworks.com/tag/cve-2026-31431/ "CVE-2026-31431") * [Kubernetes](https://unit42.paloaltonetworks.com/tag/kubernetes/ "Kubernetes") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/ "Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years") ![Pictorial representation of CVE-2023-33538. Abstract image of a glowing red Wi-Fi symbol on a circuit board, with intricate patterns and a futuristic appearance.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/04/04_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) April 16, 2026 [#### A Deep Dive Into Attempted Exploitation of CVE-2023-33538](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/) * [Botnet](https://unit42.paloaltonetworks.com/tag/botnet/ "botnet") * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2023-33538](https://unit42.paloaltonetworks.com/tag/cve-2023-33538/ "CVE-2023-33538") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/ "A Deep Dive Into Attempted Exploitation of CVE-2023-33538") ![Pictorial representation of BeyondTrust vulnerability CVE-2026-1731. Digital art depicting a stylized mountain range with vibrant blue and red hues. The peaks are accentuated by glowing particles and an abstract, starry backdrop, creating a futuristic landscape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/02/14_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) February 19, 2026 [#### VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/) * [Bash](https://unit42.paloaltonetworks.com/tag/bash/ "bash") * [CVE-2026-1731](https://unit42.paloaltonetworks.com/tag/cve-2026-1731/ "CVE-2026-1731") * [PowerShell](https://unit42.paloaltonetworks.com/tag/powershell/ "PowerShell") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/ "VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)") ![](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/02/AdobeStock_1020436911-786x440.jpeg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) February 17, 2026 [#### Critical Vulnerabilities in Ivanti EPMM Exploited](https://unit42.paloaltonetworks.com/ivanti-cve-2026-1281-cve-2026-1340/) * [CVE-2026-1281](https://unit42.paloaltonetworks.com/tag/cve-2026-1281/ "CVE-2026-1281") * [CVE-2026-1340](https://unit42.paloaltonetworks.com/tag/cve-2026-1340/ "CVE-2026-1340") * [Ivanti](https://unit42.paloaltonetworks.com/tag/ivanti/ "Ivanti") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ivanti-cve-2026-1281-cve-2026-1340/ "Critical Vulnerabilities in Ivanti EPMM Exploited") ![Pictorial representation of CVE-2025-0921. Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/01/06_Vulnerabilities_1920x900-2-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) January 30, 2026 [#### Privileged File System Vulnerability Present in a SCADA System](https://unit42.paloaltonetworks.com/iconics-suite-cve-2025-0921/) * [CVE-2025-0921](https://unit42.paloaltonetworks.com/tag/cve-2025-0921/ "CVE-2025-0921") * [Privilege escalation](https://unit42.paloaltonetworks.com/tag/privilege-escalation/ "privilege escalation") * [SCADA](https://unit42.paloaltonetworks.com/tag/scada/ "SCADA") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/iconics-suite-cve-2025-0921/ "Privileged File System Vulnerability Present in a SCADA System") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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