CVE-2021-31864 · cross-distro fix matrix

CVE-2021-31864: 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.

Affects 2 Linux releases across 2 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-31864 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

redmine→ fixed in5.0.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y redmine
```

Debian trixie

Source: Debian Security Tracker

redmine→ fixed in5.0.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y redmine
```

Are YOU affected by CVE-2021-31864?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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