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[Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/ "Vulnerabilities") [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) # Threat Brief: Meltdown and Spectre Vulnerabilities ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 4 min read * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Unit 42](https://unit42.paloaltonetworks.com/author/unit42/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:January 4, 2018 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) * [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: * [AMD](https://unit42.paloaltonetworks.com/tag/amd/) * [Android](https://unit42.paloaltonetworks.com/tag/android/) * [ARM](https://unit42.paloaltonetworks.com/tag/arm/) * [Intel](https://unit42.paloaltonetworks.com/tag/intel/) * [Linux](https://unit42.paloaltonetworks.com/tag/linux/) * [MacOS](https://unit42.paloaltonetworks.com/tag/macos/) * [Microsoft Windows](https://unit42.paloaltonetworks.com/tag/microsoft-windows/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/threat-brief-meltdown-spectre-vulnerabilities/?pdf=download&lg=en&_wpnonce=ac4b3be3b8 "Click here to download") * [![Print 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fthreat-brief-meltdown-spectre-vulnerabilities%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=Threat%20Brief:%20Meltdown%20and%20Spectre%20Vulnerabilities%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fthreat-brief-meltdown-spectre-vulnerabilities%2F "Share in Mastodon") Bottom line up front: * The Meltdown and Spectre vulnerabilities are serious vulnerabilities * These vulnerabilities are uniquely broad in scope potentially affecting nearly every computer and device with a modern processor: Microsoft Windows, Google Android, Google ChromeOS, Apple macOS, on Intel and ARM processors. * These are not code execution vulnerabilities (i.e. wormable): they are information disclosure vulnerabilities * These vulnerabilities pose greatest risk in shared hosting scenarios (i.e. cloud) * The risk these vulnerabilities pose for end users is that malicious code or script could use them to obtain sensitive information like usernames, passwords, and bank account information * Because of the breadth of these vulnerabilities, IoT devices and many mobile devices may never receive fixes to address them * Everyone should act to apply security updates as soon as possible * Patches are now available for most major platforms * Everyone should update their systems and devices as soon as possible * Cloud service users likely do not need take action: most providers are updating to protect their infrastructure against these vulnerabilities; please check with your respective provider Overview In the past 48 hours, there has been a flurry of activity as hardware and software vendors move to address two sets of vulnerabilities that have been dubbed "Meltdown" and "Spectre". This blog is meant to give an overview of the situation, the vulnerabilities, assist Palo Alto Networks customers and others with their risk assessment, and provide recommendations for actions they can take to prevent successful attacks against these vulnerabilities. Situation On January 3, 2018, researchers, including those with [Google Project Zero](https://security.googleblog.com/2018/01/todays-cpu-vulnerability-what-you-need.html), released information on three new [vulnerabilities](https://googleprojectzero.blogspot.ro/2018/01/reading-privileged-memory-with-side.html): * CVE-2017-5753: bounds check bypass * CVE-2017-5715: branch target injection * CVE-2017-5754: rogue data cache load They grouped these vulnerabilities under the names "Spectre" (CVE-2017-5753 and CVE-2017-5715) and "Meltdown" (CVE-2017-5754). Comprehensive details on both of these are available at [https://meltdownattack.com](https://meltdownattack.com). Security updates to address these vulnerabilities began to be released prior to disclosure on January 3, 2018. Security updates are continuing to be released and are expected to be released over time due to the uniquely broad nature of these vulnerabilities. At the time of this writing, there are no known active attacks against any of these vulnerabilities. Vulnerabilities These vulnerabilities present a unique situation because they ultimately are hardware-based vulnerabilities. All three stem from issues in modern processors and are known to affect Intel and ARM chips. The vulnerability status of AMD chips is unclear at the time of this writing. Because these affect processors, this means that the operating systems and applications that run on top of these processors are vulnerable. Because these vulnerabilities affect the processors at the physical layer, the only way for the vulnerabilities to be fully addressed is for the processors to be replaced or to have a firmware update. Until then, the makers of operating systems can (and have) released patches that make the physical-layer vulnerabilities inaccessible. For all intents and purposes, it "patches" the vulnerabilities. Full technical details on the vulnerabilities are available at the sites referenced above. But the key point to understand about these vulnerabilities is that they are information disclosure vulnerabilities that can enable processes and applications to access information they otherwise shouldn't be able to: user-mode applications can access privileged information in the kernel and throughout the operating system. For regular end-user systems and devices, malware and malicious scripts can use these vulnerabilities to access information like usernames, passwords and account information. For shared-hosting environments like public cloud providers, this means that one hosted customer could potentially access the information of any other customer hosted on the same hardware. Based on analysis of the vulnerabilities, an industry consensus is emerging that generic protections against attacks aimed at these vulnerabilities will be difficult, if not impossible to develop. This means that prevention against attacks will have to focus on specific malware, attacks, and hosting sites as they emerge. Risk Assessment Because these are information disclosure vulnerabilities, they don't pose the same, immediate danger like [WannaCry/WanaCrypt0r](https://blog.paloaltonetworks.com/2017/05/unit42-threat-brief-wanacrypt0r-know/) or [Petya/NotPetya](https://blog.paloaltonetworks.com/2017/06/unit42-threat-brief-petya-ransomware/). This has more in common with the [Heartbleed](https://blog.paloaltonetworks.com/2014/04/8-tips-dealing-heartbleed/) event of 2014. In terms of the severity of the vulnerabilities themselves: they are important, but not critical. They are information disclosure, not code execution, vulnerabilities. The greatest area of risk is in shared-hosting scenarios. Fortunately, most cloud providers have already deployed security updates and those that haven't are expected to do so shortly. For end-users and those managing networks, the greatest risk these vulnerabilities pose is exploitation by malware seeking to gather information like usernames and passwords from systems. What makes these vulnerabilities most notable from a risk assessment point of view is breadth of exposure. Since these potentially affect nearly every device with a modern processor, that means that full mitigation and remediation may not be possible. Older systems (like Windows XP) and devices (like older Android smartphones and IoT devices) will likely never receive fixes for these vulnerabilities. Calls to Action The actions to take in response to this event are clear and simple: 1. Users of shared-hosting (i.e. cloud) services should check with their service provider to confirm they've applied security updates to address these vulnerabilities. 2. Administrators and end-users should deploy security updates to all systems and devices as soon as they're available. 3. Administrators and end-users should consider retiring systems and devices that will not be updated as soon as possible. 4. Administrators and end-users should use comprehensive network and endpoint security that can help prevent attacks that seek to exploit these vulnerabilities. As always, we will continue to watch this event closely and provide any updates that we can. For information on how Palo Alto Networks products are affected by these issues, customers can see our posting on the Live Community at: [https://live.paloaltonetworks.com/t5/Customer-Advisories/Information-about-Meltdown-and-Spectre-findings/ta-p/193878/jump-to/first-unread-message](https://live.paloaltonetworks.com/t5/Customer-Advisories/Information-about-Meltdown-and-Spectre-findings/ta-p/193878/jump-to/first-unread-message). If you have any questions, please visit the [Threat \& Vulnerability Discussions on our Live Community](https://live.paloaltonetworks.com/t5/Threat-Vulnerability-Discussions/bd-p/Threat_Discussions). Back to top ### Tags * [AMD](https://unit42.paloaltonetworks.com/tag/amd/ "AMD") * [Android](https://unit42.paloaltonetworks.com/tag/android/ "Android") * [ARM](https://unit42.paloaltonetworks.com/tag/arm/ "ARM") * [Intel](https://unit42.paloaltonetworks.com/tag/intel/ "Intel") * [Linux](https://unit42.paloaltonetworks.com/tag/linux/ "Linux") * [MacOS](https://unit42.paloaltonetworks.com/tag/macos/ "macOS") * [Microsoft Windows](https://unit42.paloaltonetworks.com/tag/microsoft-windows/ "Microsoft Windows") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Palo Alto Networks Unit 42 Vulnerability Research December 2017 Disclosures - Microsoft](https://unit42.paloaltonetworks.com/unit42-palo-alto-networks-unit-42-vulnerability-research-december-2017-disclosures-microsoft/ "Palo Alto Networks Unit 42 Vulnerability Research December 2017 Disclosures - Microsoft") ### Related Articles * [Atomic macOS (AMOS) Stealer Activity](https://unit42.paloaltonetworks.com/atomic-macos-amos-stealer-activity/ "article - table of contents") * [The Machine With Many Faces: Post-Exploitation Identity Misuse in SPIFFE/SPIRE](https://unit42.paloaltonetworks.com/kubernetes-spiffe-spire-identity-spoofing/ "article - table of contents") * [Kimwolf v7: An Evolution of the Kimwolf Botnet](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/ "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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