CVE-2021-34337

Name: CVE-2021-34337
Creator: NVD / NIST
Published: 2023-04-15T20:16:00.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2021-34337 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. The REST API is bound to localhost by default, limiting the ability for attackers to exploit this, but can optionally be made to listen on other interfaces.

Metrics

CVSS 3.1

6.3/10

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

EPSS Probability

0.30%

21.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-208

Affected Software

Vendor	Product	Versions
Gnu	Mailman	< 3.3.5

References

https://gitlab.com/mailman/mailman/-/commit/e4a39488c4510fcad8851217f10e7337a196bb51Patch, Vendor Advisory
https://gitlab.com/mailman/mailman/-/issues/911Broken Link
https://gitlab.com/mailman/mailman/-/tagsRelease Notes
https://gitlab.com/mailman/mailman/-/commit/e4a39488c4510fcad8851217f10e7337a196bb51Patch, Vendor Advisory
https://gitlab.com/mailman/mailman/-/issues/911Broken Link
https://gitlab.com/mailman/mailman/-/tagsRelease Notes

Timeline

Published: Apr 15, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34337?

How severe is CVE-2021-34337?

CVE-2021-34337 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34337?

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-2021-34337?

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

Scan your code now

Source: NVD / NIST