CVE-2021-34337: gnu mailman Observable Timing Discrepancy

Vulnerability summary

CVE-2021-34337 is a medium (CVSS 6.3) Observable Timing Discrepancy vulnerability in gnu mailman. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.5% of scored vulnerabilities.

Timeline

1. 15-04-2023
   PublishedVulnerability first disclosed.
2. 06-02-2025
   Last modifiedVulnerability information updated.

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.

• CWE-208Observable Timing DiscrepancyTwo separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.