CVE-2021-28374

Name: CVE-2021-28374
Creator: NVD / NIST
Published: 2021-03-15T05:15:12.467+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.28%

Last modified Jun 17, 2026

CVE-2021-28374 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.28% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.28%

66.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Debian	Courier-Authlib	< 0.71.1-2
Debian	Debian Linux	9.0

References

https://bugs.debian.org/984810Mailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00011.htmlMailing List, Third Party Advisory
https://bugs.debian.org/984810Mailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00011.htmlMailing List, Third Party Advisory

Timeline

Published: Mar 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28374?

How severe is CVE-2021-28374?

CVE-2021-28374 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28374?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28374?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST