CVE-2010-4180: OpenSSL before 0.9.8q, and 1.0.x before 1.0.0c, when SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG is enabled, do...

Security readout for executives and security teams

This is an old OpenSSL flaw that could let a remote attacker force a resumed TLS session onto an unintended cipher. The business risk is weakened encrypted communications, but the issue depends on an obsolete compatibility option being enabled and very old OpenSSL versions being present. Exposure is most likely in legacy systems, appliances, or bundled applications still using vulnerable OpenSSL releases with the named Netscape compatibility option enabled. Modern OpenSSL deployments are unlikely to be affected, but embedded or vendor-packaged software should be checked. Treat this as a legacy cryptography hygiene issue, not an emergency absent evidence of exposed vulnerable systems. Prioritize environments with old OpenSSL, internet-facing TLS, or unmanaged appliances because successful exploitation could weaken confidentiality assumptions. Mitigation focus: Upgrade OpenSSL to 0.9.8q, 1.0.0c, or a later vendor-fixed release.; Apply relevant OS or appliance vendor security updates listed in the advisories.; Disable SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG unless a documented compatibility requirement remains..

Prepared

Jun 28, 2026, 01:17 UTC (UTC+00:00)

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