CVE-2007-5715: DenyHosts 2.6 processes OpenSSH sshd "not listed in AllowUsers" log messages with an incorrect regular expr...

Security readout for executives and security teams

DenyHosts 2.6 may miss a class of invalid SSH login attempts when OpenSSH reports that a username is not allowed by AllowUsers. That can let attackers avoid DenyHosts blocking for those attempts, reducing a defensive control rather than directly compromising a host. Exposure is likely limited to systems running DenyHosts 2.6 with OpenSSH sshd, especially where AllowUsers is configured and DenyHosts is relied on for automated SSH blocking. Treat this as a defense-evasion weakness in an old SSH protection tool. Prioritize if any internet-facing SSH systems still depend on DenyHosts 2.6, but evidence does not support emergency treatment from the provided sources. Mitigation focus: Identify any hosts running DenyHosts 2.6.; Check Red Hat, Gentoo, or vendor guidance for fixed packages or advisories.; Do not rely on DenyHosts alone for SSH brute-force protection..

Prepared

Jun 29, 2026, 01:47 UTC (UTC+00:00)

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