{"id":9530,"date":"2026-10-28T21:45:30","date_gmt":"2026-10-28T21:45:30","guid":{"rendered":"https:\/\/silvybrand.com\/?p=9530"},"modified":"2026-10-28T21:45:30","modified_gmt":"2026-10-28T21:45:30","slug":"most-servers-on-the-planet-are-vulnerable-to-a-code-execution-flaw-in-uefi-firmware","status":"publish","type":"post","link":"https:\/\/silvybrand.com\/?p=9530","title":{"rendered":"Most Servers on the Planet Are Vulnerable to This Firmware Code-Execution Flaw"},"content":{"rendered":"<p><br \/>\n<\/p>\n<div>\n<p><span class=\"lead-in-text-callout\">Defenders across the<\/span> world face the burden of responding to <a href=\"https:\/\/www.wired.com\/story\/hackers-exploited-the-php-vulnerabilities-days-before-they-were-patched\/\" class=\"text link\">yet another<\/a> botched code-execution vulnerability, this time in boot-time firmware used by most of the world\u2019s server vendors and data centers.<\/p>\n<p class=\"paywall\">The vulnerability, with a severity rating of 9.5 out of 10, resides in the TianoCore <a data-offer-url=\"https:\/\/www.tianocore.org\/tianocore-wiki.github.io\/reference\/external-resources\/edk_ii.html\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/www.tianocore.org\/tianocore-wiki.github.io\/reference\/external-resources\/edk_ii.html&quot;}\" href=\"https:\/\/www.tianocore.org\/tianocore-wiki.github.io\/reference\/external-resources\/edk_ii.html\" rel=\"nofollow noopener\" target=\"_blank\">EDK II<\/a>, an open source codebase that hardware makers and cloud providers use to create the UEFI firmware that runs during the boot-up sequence. Last year, a representative of the UEFI Forum <a data-offer-url=\"https:\/\/uefi.org\/sites\/default\/files\/resources\/State%20of%20UEFI_UEFI%202025%20DevCon_Final.pdf\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/uefi.org\/sites\/default\/files\/resources\/State%20of%20UEFI_UEFI%202025%20DevCon_Final.pdf&quot;}\" href=\"https:\/\/uefi.org\/sites\/default\/files\/resources\/State%20of%20UEFI_UEFI%202025%20DevCon_Final.pdf\" rel=\"nofollow noopener\" target=\"_blank\">called<\/a> EDK2 the \u201cpreeminent solution \/ implementation of the UEFI specifications.\u201d Virtually all UEFI suppliers (sometimes still called IBVs or independent BIOS vendors), including AMI, Insyde, and Phoenix, use the reference code extensively. Project Mu, Microsoft\u2019s hardened EDK2 fork, used the code containing the vulnerable component as well.<\/p>\n<p class=\"paywall\">The vulnerability, tracked as CVE-2026-97631, is a memory-corruption flaw in an ICMP component that attackers can exploit to execute malicious code that runs before the operating system and firmware can implement defenses like <a data-offer-url=\"https:\/\/uefi.org\/sites\/default\/files\/resources\/UEFI_Secure_Boot_in_Modern_Computer_Security_Solutions_2019.pdf\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/uefi.org\/sites\/default\/files\/resources\/UEFI_Secure_Boot_in_Modern_Computer_Security_Solutions_2019.pdf&quot;}\" href=\"https:\/\/uefi.org\/sites\/default\/files\/resources\/UEFI_Secure_Boot_in_Modern_Computer_Security_Solutions_2019.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Secure Boot<\/a>, which establishes a chain of trust for all code, including the <a data-offer-url=\"https:\/\/www.trustedcomputinggroup.org\/work-groups\/tpm\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/www.trustedcomputinggroup.org\/work-groups\/tpm&quot;}\" href=\"https:\/\/www.trustedcomputinggroup.org\/work-groups\/tpm\" rel=\"nofollow noopener\" target=\"_blank\">Trusted Platform Module<\/a> (TPM), loaded during boot. While final payloads delivered by CVE-2026-97631 have no persistence\u2014meaning they run only once\u2014they can give attackers <a href=\"https:\/\/www.wired.com\/story\/a-design-flaw-in-share-links-exposes-users-personal-conversations-with-meta-muse\/\" class=\"text link\">a wide opening<\/a> to install other payloads that also run each time early in the boot process.<\/p>\n<h2 class=\"paywall\">The Cat Has Left the Bag<\/h2>\n<p class=\"paywall\">The parties that discovered CVE-2026-97631\u2014Alex Matrosov of Anthropic and Dan Holmes of Google\u2014had arranged for it to <a href=\"https:\/\/www.wired.com\/story\/openai-agent-hacked-australias-health-service-their-government-found-out-months-later\/\" class=\"text link\">stay under wraps<\/a> until a coordinated disclosure that was scheduled for January. AMI, a maker of motherboards and other hardware, published <a data-offer-url=\"https:\/\/github.com\/tianocore\/edk2\/pull\/13200\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/github.com\/tianocore\/edk2\/pull\/13200&quot;}\" href=\"https:\/\/github.com\/tianocore\/edk2\/pull\/13200\" rel=\"nofollow noopener\" target=\"_blank\">this pull request<\/a> last month that detailed the vulnerability and included a code fix. Once the post came to the attention of the discovering parties, TianoCore Project members published a <a data-offer-url=\"https:\/\/github.com\/tianocore\/edk2\/security\/advisories\/GHSA-99cj-7hg9-mp4m\" class=\"external-link text link\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/github.com\/tianocore\/edk2\/security\/advisories\/GHSA-99cj-7hg9-mp4m&quot;}\" href=\"https:\/\/github.com\/tianocore\/edk2\/security\/advisories\/GHSA-99cj-7hg9-mp4m\" rel=\"nofollow noopener\" target=\"_blank\">public advisory<\/a> last week.<\/p>\n<p class=\"paywall\">With publicly available patch code, it will be trivial for advanced hackers to learn how the vulnerability is triggered and to build working exploits. Further compounding the urgency, patching UEFI code vulnerabilities in millions of end <a href=\"https:\/\/www.wired.com\/story\/nightmare-scenario-zero-click-spyware-is-infecting-phones-via-targeted-ads\/\" class=\"text link\">devices sold<\/a> and used by thousands of hardware makers and cloud providers is cumbersome and time-consuming. Word of the vulnerability comes six days after another botched disclosure, this one involving a <a href=\"https:\/\/arstechnica.com\/security\/2026\/10\/php-maintainers-tell-web-devs-to-prepare-themselves-for-critical-security-patches\/\" class=\"text link\">critical code-execution vulnerability<\/a> in the PHP programming language.<\/p>\n<p class=\"paywall\">\u201cThis vulnerability in the ICMP parser of the EDK2 network stack is interesting in terms of how it affects the chain of trust and the broader ecosystem,\u201d said HD Moore, creator of Metasploit and chief research officer at security firm Dragos. \u201cAn attacker intent on compromising a nearby endpoint or server could use this bug to hijack program flow at a point where the boot process still has access to sensitive components, like the endpoint\u2019s TPM. This could be used to <a href=\"https:\/\/www.wired.com\/story\/kernel-panic-encryption-is-getting-squeezed-from-all-sides\/\" class=\"text link\">break disk encryption<\/a> for cases where an attacker has short-term network access (and it would be even easier in a theft scenario).\u201d<\/p>\n<p class=\"paywall\">CVE-2026-97631 is a 16-year-old buffer overflow in the PXE-Base Code driver (NetworkPkg\/UefiPxeBcDxe), which is responsible for allowing servers, storage equipment, and other devices to boot using code downloaded from a local network. During this process\u2014known as the pre-execution environment boot\u2014the driver uses a network listener to monitor for ICMP errors. Because the driver doesn\u2019t enforce a memory copy limit of 504 bytes, overwriting adjacent data, a <a href=\"https:\/\/www.wired.com\/story\/openais-hacking-debacle-was-a-human-mistake\/\" class=\"text link\">malicious insider<\/a> or a hacker who has gained low-level access to a local network can send an error message that appends code past this limit. The IUEFI module running on the CPU then becomes corrupted.<\/p>\n<\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/www.wired.com\/story\/most-servers-on-the-planet-are-vulnerable-to-a-code-execution-flaw-in-uefi-firmware\/\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Defenders across the world face the burden of responding to yet another botched code-execution vulnerability, this time in boot-time firmware used by most of the world\u2019s server vendors and data centers. The vulnerability, with a severity rating of 9.5 out of 10, resides in the TianoCore EDK II, an open source codebase that hardware makers [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9531,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[535,1058,250,1572,350,352,1573,351],"class_list":["post-9530","post","type-post","status-publish","format-standard","has-post-thumbnail","category-gadgets","tag-ars-technica","tag-cyberattacks","tag-cybersecurity","tag-firmware","tag-hacking","tag-malware","tag-servers","tag-vulnerabilities"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Most Servers on the Planet Are Vulnerable to This Firmware Code-Execution Flaw - Silvybrand Lifestyle Blog<\/title>\n<meta name=\"description\" content=\"The critical flaw in UEFI firmware\u2014used by most server vendors and data centers\u2014allows attackers to execute code early in the boot process.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/silvybrand.com\/?p=9530\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Most Servers on the Planet Are Vulnerable to This Firmware Code-Execution Flaw - 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