CVE-2021-35525: Postsrsd Project Postsrsd

Medium severity, CVSS 5.3. EPSS: 1.7% chance of exploitation in the next 30 days.

PostSRSd before 1.11 allows a denial of service (subprocess hang) if Postfix sends certain long data fields such as multiple concatenated email addresses. NOTE: the PostSRSd maintainer acknowledges "theoretically, this error should never occur ... I'm not sure if there's a reliable way to trigger this condition by an external attacker, but it is a security bug in PostSRSd nevertheless."

Affected products

Published 2021-06-28. Last modified 2026-06-17.