CVE-2006-6302: fail2ban 0.7.4 and earlier does not properly parse sshd log files, which allows remote attackers to add arb...

Security readout for executives and security teams

Older fail2ban versions could be tricked into blocking IP addresses chosen by a remote attacker. The business impact is denial of service: legitimate administrators or users may be locked out of SSH if their IP address is added to /etc/hosts.deny. Exposure is limited to systems running fail2ban 0.7.4 or earlier, configured to monitor sshd logs and update /etc/hosts.deny. Modern deployments are less likely affected, but legacy servers, appliances, or unmaintained images should be checked. Treat this as a legacy exposure cleanup item unless old fail2ban is found on critical remote-access systems. Prioritize internet-facing SSH management hosts because the impact can block legitimate access during operations or incident response. Mitigation focus: Inventory fail2ban versions and prioritize any 0.7.4 or earlier installations.; Check Gentoo or distribution vendor guidance for fixed packages or recommended updates.; Upgrade or replace unsupported fail2ban deployments through approved package channels..

Prepared

Jun 29, 2026, 08:58 UTC (UTC+00:00)

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