CVE-2005-4153: Mailman 2.1.4 through 2.1.6 allows remote attackers to cause a denial of service via a message that causes...

Security readout for executives and security teams

This is an old Mailman denial-of-service issue. A remote sender could deliver a specially malformed message that makes vulnerable Mailman 2.1.4 through 2.1.6 fail while processing bad date data. The known impact is service disruption, not data theft or server takeover, based on the provided sources. Exposure is most likely on legacy systems still running Mailman 2.1.4 through 2.1.6, especially distribution-packaged Mailman instances receiving external mailing-list email. Modern or retired Mailman deployments are less likely affected, but version validation is required. Treat as a service availability risk for legacy mailing-list infrastructure. It is not presented as a data breach vulnerability, but externally triggered outages can affect customer communications and operational workflows. Mitigation focus: Inventory all Mailman installations and identify versions 2.1.4 through 2.1.6.; Review applicable vendor advisories for supported package updates or upgrade paths.; Prioritize remediation for internet-facing mailing-list servers receiving unauthenticated email..

Prepared

Jun 29, 2026, 16:03 UTC (UTC+00:00)

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