CVE-2010-2023: Exim

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

transports/appendfile.c in Exim before 4.72, when a world-writable sticky-bit mail directory is used, does not verify the st_nlink field of mailbox files, which allows local users to cause a denial of service or possibly gain privileges by creating a hard link to another user's file.

Affected products

• Exim Exim: up to and including 4.71; version 4.10 only; version 4.20 only; version 4.21 only; version 4.22 only; version 4.23 only; …

Published 2010-06-07. Last modified 2026-06-16.