CVE-2025-62875: Local DoS in OpenSMTPD via UNIX domain socket smtpd.sock

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-11-20 · updated 2026-10-18
Weakness: CWE-754

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in OpenSMTPD allows local users to crash OpenSMTPD. This issue affects openSUSE Tumbleweed: from ? before 7.8.0p0-1.1.

Affected products

Opensmtpd: 7.7.0-p0
openSUSE Tumbleweed: before 7.8.0p0-1.1 — fixed in 7.8.0p0-1.1

How to fix

Upgrade to a fixed version: openSUSE Tumbleweed 7.8.0p0-1.1. Check the vendor advisory for mitigations.

References

https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-62875
https://security.opensuse.org/2025/10/31/opensmtpd-local-DoS.html
http://www.openwall.com/lists/oss-security/2025/10/31/3
https://security.opensuse.org/2025/10/31/opensmtpd-local-DoS.html#reproducer

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