CVE-2021-20237 · cross-distro fix matrix

CVE-2021-20237: An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a deni

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-20237 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

zeromq3→ fixed in4.3.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y zeromq3
```

Debian bookworm

Source: Debian Security Tracker

zeromq3→ fixed in4.3.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y zeromq3
```

Debian trixie

Source: Debian Security Tracker

zeromq3→ fixed in4.3.3-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y zeromq3
```

Are YOU affected by CVE-2021-20237?

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.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2021-20237dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)