CVE-2004-2677: Format string vulnerability in qwik-smtpd.c in QwikMail SMTP (qwik-smtpd) 0.3 and earlier allows remote att...

Security readout for executives and security teams

An old QwikMail SMTP daemon version contains a remote code execution weakness. A crafted SMTP interaction could make the mail server interpret user-controlled text as formatting instructions. If this software is still exposed, the business risk is compromise of the mail host. Evidence does not show active exploitation. Exposure is limited to organizations still running QwikMail SMTP qwik-smtpd 0.3 or earlier. Internet-facing SMTP deployment increases urgency. Modern environments are unlikely to be affected unless legacy mail infrastructure remains in service. Prioritize only if legacy QwikMail SMTP is present. If found on an exposed mail server, treat as urgent remediation because compromise could give an attacker control of the host. Mitigation focus: Identify and retire unsupported QwikMail SMTP deployments where possible.; Review the referenced qwik-smtpd 0.3 patch and vendor guidance.; Restrict SMTP exposure to required networks until remediation is confirmed..

Prepared

Jun 29, 2026, 07:22 UTC (UTC+00:00)

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