OpenSSL QUIC SSL_CIPHER_find() NULL Dereference on Unknown Cipher ID
CVE-2025-15468 is a NULL pointer dereference vulnerability in OpenSSL's handling of QUIC cipher lookup. If an application using a QUIC protocol client or server calls SSL_CIPHER_find() on a cipher suite ID received from a peer, and that cipher ID is unknown or unsupported, the call can dereference a NULL pointer and terminate the process. The issue is specifically described in applications that invoke SSL_CIPHER_find() from the client_hello_cb callback while operating on an SSL object implementing QUIC. The vulnerable code path was introduced in OpenSSL 3.2 with the addition of QUIC support. Affected versions are OpenSSL 3.3, 3.4, 3.5, and 3.6; OpenSSL 3.0, 1.1.1, and 1.0.2 are not affected. The OpenSSL FIPS modules for 3.3 through 3.6 are not affected because the QUIC implementation is outside the FIPS module boundary.
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Recent activity
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An OpenSSL vulnerability patched by upgrading to OpenSSL 3.6.1 in IPFire Core Update 200.
Unknown (listed among related OpenSSL CVEs, but not described in the content).
Low-severity OpenSSL null pointer dereference in QUIC cipher lookup, likely causing denial of service in QUIC-related code paths.
An OpenSSL vulnerability addressed in Alpine Linux stable releases 3.20.9, 3.21.6, 3.22.3, and 3.23.3.
The version that knows your environment.
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.