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CVE-2023-40547 is a remote code execution vulnerability in Shim affecting the HTTP boot support path. The flaw arises because Shim trusts attacker-controlled values while parsing an HTTP response during early boot. By supplying a specially crafted malicious HTTP response, an attacker can trigger a fully controlled out-of-bounds write condition. Because the memory corruption primitive is attacker-controlled, successful exploitation can result in arbitrary code execution and full system compromise in the pre-OS boot environment. The issue is relevant to Secure Boot trust chains because compromise at this stage can enable execution of malicious code before the operating system is fully loaded.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.