CVE-2011-4318: Dovecot 2.0.x before 2.0.16, when ssl or starttls is enabled and hostname is used to define the proxy desti...

Security readout for executives and security teams

This flaw affects old Dovecot 2.0.x mail proxy deployments. When SSL or STARTTLS proxying used hostnames, Dovecot did not confirm the certificate belonged to the intended server. A network-positioned attacker could impersonate the backend SSL server using a certificate for another hostname. Exposure is limited to legacy Dovecot 2.0.x systems before 2.0.16 that proxy to hostname-defined destinations with ssl or starttls enabled. Treat as a targeted infrastructure risk, not a broad internet worm scenario. Prioritize if the organization still runs legacy Dovecot proxy tiers, especially where mail backend traffic crosses shared, hosted, or otherwise interceptable networks. Mitigation focus: Upgrade affected Dovecot 2.0.x systems to 2.0.16 or a vendor-patched package.; Review vendor advisories for distribution-specific fixed versions and backports.; Identify Dovecot proxy configurations using ssl or starttls with hostname destinations..

Prepared

Jun 15, 2026, 04:24 UTC (UTC+00:00)

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