CVE-2014-3509: Race condition in the ssl_parse_serverhello_tlsext function in t1_lib.c in OpenSSL 1.0.0 before 1.0.0n and...

Security readout for executives and security teams

This is an old OpenSSL client-side flaw. A hostile SSL/TLS server could trigger a race condition in certain multithreaded clients using session resumption, causing memory overwrite and likely a client crash. Sources identify affected OpenSSL 1.0.0 and 1.0.1 releases and fixed versions, but do not provide a CVSS score or evidence of active exploitation. Exposure is most likely in legacy systems or applications still using affected OpenSSL branches, especially multithreaded SSL/TLS clients that resume sessions. Modern supported OpenSSL packages are likely patched, but embedded products, vendor appliances, and statically linked applications need separate verification. Treat this as a legacy exposure cleanup item unless affected outbound TLS clients remain in critical workflows. The main documented business impact is denial of service against client applications, with incomplete evidence for broader impact. Mitigation focus: Upgrade OpenSSL to 1.0.0n, 1.0.1i, or a vendor-backported fixed package.; Prioritize legacy clients that make outbound TLS connections to untrusted servers.; Check vendor advisories for appliances, embedded products, and bundled OpenSSL copies..

Prepared

Jun 14, 2026, 07:14 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.