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CVE-2021-33477 · cross-distro fix matrix

CVE-2021-33477: rxvt-unicode 9.22, rxvt 2.7.10, mrxvt 0.5.4, and Eterm 0.9.7 allow (potentially remote) code execution because of improper handling of certain escape sequences (ESC G Q). A response is terminated by a newline.

Affects 8 Linux releases across 15 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-33477 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

eterm→ fixed in0.9.6-6.1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y eterm
```
rxvt-unicode→ fixed in9.22-11urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rxvt-unicode
```

Debian bookworm

Source: Debian Security Tracker

eterm→ fixed in0.9.6-6.1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y eterm
```
rxvt-unicode→ fixed in9.22-11urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rxvt-unicode
```

Debian trixie

Source: Debian Security Tracker

rxvt-unicode→ fixed in9.22-11urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y rxvt-unicode
```

Alpine v3.20

Source: Alpine secdb

mrxvt→ fixed in0.5.4-r9
```
apk update && apk add --upgrade mrxvt
```

rxvt-unicode→ fixed in9.26-r0

apk update && apk add --upgrade rxvt-unicode

Alpine v3.21

Source: Alpine secdb

mrxvt→ fixed in0.5.4-r9
```
apk update && apk add --upgrade mrxvt
```

rxvt-unicode→ fixed in9.26-r0

apk update && apk add --upgrade rxvt-unicode

Alpine edge

Source: Alpine secdb

mrxvt→ fixed in0.5.4-r9
```
apk update && apk add --upgrade mrxvt
```

rxvt-unicode→ fixed in9.26-r0

apk update && apk add --upgrade rxvt-unicode

Alpine v3.18

Source: Alpine secdb

mrxvt→ fixed in0.5.4-r9
```
apk update && apk add --upgrade mrxvt
```

rxvt-unicode→ fixed in9.26-r0

apk update && apk add --upgrade rxvt-unicode

Alpine v3.19

Source: Alpine secdb

mrxvt→ fixed in0.5.4-r9
```
apk update && apk add --upgrade mrxvt
```

rxvt-unicode→ fixed in9.26-r0

apk update && apk add --upgrade rxvt-unicode

Are YOU affected by CVE-2021-33477?

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

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