CVE-2021-28374

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-15 · updated 2026-06-17
Weakness: CWE-732

Description

The Debian courier-authlib package before 0.71.1-2 for Courier Authentication Library creates a /run/courier/authdaemon directory with weak permissions, allowing an attacker to read user information. This may include a cleartext password in some configurations. In general, it includes the user's existence, uid and gids, home and/or Maildir directory, quota, and some type of password information (such as a hash).

Affected products

Debian Courier-Authlib: before 0.71.1-2 — fixed in 0.71.1-2
Debian Linux: 9.0

How to fix

Upgrade to a fixed version: Debian Courier-Authlib 0.71.1-2. Check the vendor advisory for mitigations.

References

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