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CVE-2024-6197 is a vulnerability in libcurl’s ASN.1 parser, specifically in the utf8asn1str() function used to process ASN.1 UTF-8 strings during certificate parsing. When the function detects an invalid field and returns an error, it incorrectly calls free() on a 4-byte local stack buffer rather than heap-allocated memory. On allocators that strictly validate free() arguments, this typically causes an immediate abort. On allocators that accept the invalid pointer, the operation can corrupt allocator state and lead to overwriting adjacent stack memory. The overwrite contents depend on allocator behavior and may include pointer-like values and flags. The vulnerable code path can be reached when a client using libcurl connects to a malicious server that presents a specially crafted TLS certificate.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A curl vulnerability affecting CBL Mariner and Windows, included as advisory information in the October release.
A zero-day vulnerability in libcurl where utf8asn1str() mishandles ASN.1 UTF-8 strings, leading to stack memory overwrite and possible application crash or further exploitation via a malicious TLS certificate.
A remote code execution vulnerability in open source Curl, exploitable when a client connects to a malicious server.
A remote code execution vulnerability in the open source Curl library.
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.