What’s Vulnerable › Vulnerabilities

CVE-2021-31865

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-28 · updated 2026-06-17

Description

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to circumvent the allowed filename extensions of uploaded attachments.

Affected products

• Debian Linux: 9.0
• Redmine: before 4.0.9; from 4.1.0 before 4.1.3; from 4.2.0 before 4.2.1 — fixed in 4.0.9, 4.1.3, 4.2.1

How to fix

Upgrade to a fixed version: Redmine 4.0.9, 4.1.3, 4.2.1. 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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