What’s Vulnerable › Vulnerabilities

CVE-2021-31866

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-28 · updated 2026-06-17
• Weakness: CWE-203

Description

Redmine before 4.0.9 and 4.1.x before 4.1.3 allows an attacker to learn the values of internal authentication keys by observing timing differences in string comparison operations within SysController and MailHandlerController.

Affected products

• Debian Linux: 9.0
• Redmine: before 4.0.9; from 4.1.0 before 4.1.3 — fixed in 4.0.9, 4.1.3

How to fix

Upgrade to a fixed version: Redmine 4.0.9, 4.1.3. Check the vendor advisory for mitigations.

References

• https://lists.debian.org/debian-lts-announce/2021/05/msg00013.html
• https://www.redmine.org/news/131
• https://www.redmine.org/projects/redmine/wiki/Security_Advisories
• https://lists.debian.org/debian-lts-announce/2021/05/msg00013.html
• https://www.redmine.org/news/131
• https://www.redmine.org/projects/redmine/wiki/Security_Advisories

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