CVE-2020-5239

Name: CVE-2020-5239
Creator: NVD / NIST
Published: 2020-02-13T01:15:11.047+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2020-5239 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In Mailu before version 1.7, an authenticated user can exploit a vulnerability in Mailu fetchmail script and gain full access to a Mailu instance. Mailu servers that have open registration or untrusted users are most impacted. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

In Mailu before version 1.7, an authenticated user can exploit a vulnerability in Mailu fetchmail script and gain full access to a Mailu instance. Mailu servers that have open registration or untrusted users are most impacted. The master and 1.7 branches are patched on our git repository. All Docker images published on docker.io/mailu for tags 1.5, 1.6, 1.7 and master are patched. For detailed instructions about patching and securing the server afterwards, see https://github.com/Mailu/Mailu/issues/1354

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.89%

54.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Mailu	Mailu	< 1.7

References

https://github.com/Mailu/Mailu/issues/1354Third Party Advisory
https://github.com/Mailu/Mailu/security/advisories/GHSA-2467-p5gv-58q6Mitigation, Third Party Advisory
https://github.com/Mailu/Mailu/issues/1354Third Party Advisory
https://github.com/Mailu/Mailu/security/advisories/GHSA-2467-p5gv-58q6Mitigation, Third Party Advisory

Timeline

Published: Feb 13, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5239?

How severe is CVE-2020-5239?

CVE-2020-5239 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5239?

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-2020-5239?

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

Scan your code now

Source: NVD / NIST