CVE-2021-21806 · cross-distro fix matrix

CVE-2021-21806: An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.3 x64. A specially crafted HTML web page can cause a use-after-free condition, resulting in remote code execution. The victim needs to visit a malicious web site to trigger the vulnerability.

Affects 6 Linux releases across 9 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-21806 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

webkit2gtk→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y webkit2gtk
```
wpewebkit→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y wpewebkit
```

Debian bookworm

Source: Debian Security Tracker

webkit2gtk→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y webkit2gtk
```
wpewebkit→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y wpewebkit
```

Debian trixie

Source: Debian Security Tracker

webkit2gtk→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y webkit2gtk
```
wpewebkit→ fixed in2.30.6-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y wpewebkit
```

Alpine v3.20

Source: Alpine secdb

webkit2gtk→ fixed in2.30.6-r0

apk update && apk add --upgrade webkit2gtk

Alpine v3.18

Source: Alpine secdb

webkit2gtk→ fixed in2.30.6-r0

apk update && apk add --upgrade webkit2gtk

Alpine v3.19

Source: Alpine secdb

webkit2gtk→ fixed in2.30.6-r0

apk update && apk add --upgrade webkit2gtk

Are YOU affected by CVE-2021-21806?

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-2021-21806dropped 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)