CVE-2021-31864 Missing authorization in n/a

What is CVE-2021-31864?

CVE-2021-31864 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 28 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows attackers to bypass the add_issue_notes permission requirement by leveraging the incoming mail handler.

Which versions are affected by CVE-2021-31864?

1 open source package ship an affected version, including redmine. It affects 2 products.

Products include Debian Debian Linux, Redmine Redmine.

How do I fix CVE-2021-31864?

Upgrade redmine to a fixed version for your release line: 4.0.9, 4.1.3 or 4.2.1.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-31864 being exploited?

There is no known exploitation of CVE-2021-31864 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-redmine-2021-31864, DEBIAN-CVE-2021-31864, GHSA-jx78-fjmh-q5cc, UBUNTU-CVE-2021-31864.