[![Logo](https://www.paloaltonetworks.com/wp-content/uploads/2021/07/PANW_Parent.png)](https://www.paloaltonetworks.com/) [![Unit42 Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/unit42-logo-white.svg)](https://unit42.paloaltonetworks.com/) Menu * [Tools](https://unit42.paloaltonetworks.com/tools/) * [ATOMs](https://unit42.paloaltonetworks.com/atoms/) * [Security Consulting](https://www.paloaltonetworks.com/unit42) * [About Us](https://unit42.paloaltonetworks.com/about-unit-42/) * [**Under Attack?**](https://start.paloaltonetworks.com/contact-unit42.html) * [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/ "Threat Research") * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/ "Vulnerabilities") [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) # Palo Alto Networks Identifies 21 New Critical Vulnerabilities in Internet Explorer ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Ryan Olson](https://unit42.paloaltonetworks.com/author/ryan-olson/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:June 10, 2014 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [Internet Explorer](https://unit42.paloaltonetworks.com/tag/internet-explorer/) * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/) * [Microsoft Security Bulletin](https://unit42.paloaltonetworks.com/tag/microsoft-security-bulletin/) * [Patch Tuesday](https://unit42.paloaltonetworks.com/tag/patch-tuesday/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/palo-alto-networks-identifies-new-critical-vulnerabilities-internet-explorer/?pdf=download&lg=en&_wpnonce=edee969a51 "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/palo-alto-networks-identifies-new-critical-vulnerabilities-internet-explorer/?pdf=print&lg=en&_wpnonce=edee969a51 "Click here to print") Share![Down 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Palo Alto Networks is committed not only to detecting attacks, but preventing them as well. Our internal research team discovered each of these 21 vulnerabilities and reported them to Microsoft so they could begin building and testing patches. Microsoft has already credited our team with 14 previous IE vulnerabilities in 2014, bringing our total for the year up to 35. We want to acknowledge Palo Alto Networks researchers Bo Qu, Hui Gao, Royce Lu, Xin Ouyang and the entire IPS team for all of the hard work they've put into discovering and validating these vulnerabilities. ### Here's what you need to know * All 21 vulnerabilities are rated Critical because they allow for code execution without user interaction. * The most-likely attack vectors are drive-by downloads through compromised websites and spear phishing e-mails which link to malicious web pages. * We have not detected exploitation of these vulnerabilities in the wild at this time, but our threat intelligence team is monitoring for changes in the environment. The table below provides a summary of the vulnerabilities and which versions of Internet Explorer they impact. |-------------------------------------------------------------------------------|---------------------------------------------------|---|---|---|---|----|----| | CVE Identifier | Title | 6 | 7 | 8 | 9 | 10 | 11 | | [CVE-2014-1766](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1766) | Internet Explorer Memory Corruption Vulnerability | | | | X | X | X | | [CVE-2014-1775](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1775) | Internet Explorer Memory Corruption Vulnerability | X | X | X | X | X | X | | [CVE-2014-1784](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1784) | Internet Explorer Memory Corruption Vulnerability | | | | X | X | X | | [CVE-2014-1785](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1785) | Internet Explorer Memory Corruption Vulnerability | | | | | | X | | [CVE-2014-1789](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1789) | Internet Explorer Memory Corruption Vulnerability | | | | | X | | | [CVE-2014-1791](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1791) | Internet Explorer Memory Corruption Vulnerability | | X | X | X | X | X | | [CVE-2014-1796](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1796) | Internet Explorer Memory Corruption Vulnerability | X | | X | X | X | X | | [CVE-2014-1799](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1799) | Internet Explorer Memory Corruption Vulnerability | X | X | X | X | X | X | | [CVE-2014-1802](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1802) | Internet Explorer Memory Corruption Vulnerability | | | | | X | X | | [CVE-2014-1803](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1803) | Internet Explorer Memory Corruption Vulnerability | X | X | X | X | X | X | | [CVE-2014-1804](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1804) | Internet Explorer Memory Corruption Vulnerability | | | X | | | | | [CVE-2014-2755](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2755) | Internet Explorer Memory Corruption Vulnerability | | | | | | X | | [CVE-2014-2756](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2756) | Internet Explorer Memory Corruption Vulnerability | | | | | X | X | | [CVE-2014-2759](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2759) | Internet Explorer Memory Corruption Vulnerability | | | | X | X | X | | [CVE-2014-2765](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2765) | Internet Explorer Memory Corruption Vulnerability | | | | X | X | X | | [CVE-2014-2766](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2766) | Internet Explorer Memory Corruption Vulnerability | | | | X | X | X | | [CVE-2014-2767](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2767) | Internet Explorer Memory Corruption Vulnerability | X | X | | | | | | [CVE-2014-2768](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2768) | Internet Explorer Memory Corruption Vulnerability | X | X | X | | | | | [CVE-2014-2769](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2769) | Internet Explorer Memory Corruption Vulnerability | | | | | X | X | | [CVE-2014-2770](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2770) | Internet Explorer Memory Corruption Vulnerability | | | X | | | | | [CVE-2014-2771](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2771) | Internet Explorer Memory Corruption Vulnerability | | | | | X | X | Internet Explorer is used in many of the networks Palo Alto Networks protects around the world and we're doing our part to make it as secure as possible. Last week we released a series of IPS signatures to detect an [advanced exploitation technique](https://blog.paloaltonetworks.com/2014/06/defend-advanced-ie-exploitation/#more-5794) that takes advantage of ActiveX. In May, [we linked](https://blog.paloaltonetworks.com/2014/05/tale-3-vulnerabilities-cve-2014-1776-exploit-linked-previous-attacks/) a recent IE 0-day ([CVE-2014-1776](https://blog.paloaltonetworks.com/2014/04/palo-alto-networks-protects-customers-critical-ie-vulnerability-cve-2014-1776/#more-5456)) to exploit code used against two other IE vulnerabilities exploited in the last 12 months. Microsoft patched [129 IE vulnerabilities](https://www.cvedetails.com/vulnerability-list/vendor_id-26/product_id-9900/year-2013/Microsoft-Internet-Explorer.html) in all of 2013 and today's release brings the 2014 total to 116. The faster the good guys track these down and get them patched, the harder we make the lives of the criminals looking to exploit them. Back to top ### Tags * [Internet Explorer](https://unit42.paloaltonetworks.com/tag/internet-explorer/ "Internet Explorer") * [Microsoft](https://unit42.paloaltonetworks.com/tag/microsoft/ "Microsoft") * [Microsoft Security Bulletin](https://unit42.paloaltonetworks.com/tag/microsoft-security-bulletin/ "Microsoft Security Bulletin") * [Patch Tuesday](https://unit42.paloaltonetworks.com/tag/patch-tuesday/ "Patch Tuesday") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: How To Defend Against Advanced IE Exploitation](https://unit42.paloaltonetworks.com/defend-advanced-ie-exploitation/ "How To Defend Against Advanced IE Exploitation") ### Related Articles * [How We Added WebAuthn to a Browser-Based RDP Client](https://unit42.paloaltonetworks.com/webauthn-added-to-browser-based-rdp/ "article - table of contents") * [Inside AD CS Escalation: Unpacking Advanced Misuse Techniques and Tools](https://unit42.paloaltonetworks.com/active-directory-certificate-services-exploitation/ "article - table of contents") * [Microsoft WSUS Remote Code Execution (CVE-2025-59287) Actively Exploited in the Wild (Updated November 3)](https://unit42.paloaltonetworks.com/microsoft-cve-2025-59287/ "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. 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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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