CVE-2021-23984 · cross-distro fix matrix

CVE-2021-23984: A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulner

Affects 8 Linux releases across 23 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-23984 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:78.9.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Debian bookworm

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:78.9.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Debian trixie

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:78.9.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Alpine v3.20

Source: Alpine secdb

firefox-esr→ fixed in78.9.0-r0

apk update && apk add --upgrade firefox-esr

firefox→ fixed in87.0-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in78.9.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.21

Source: Alpine secdb

firefox-esr→ fixed in78.9.0-r0

apk update && apk add --upgrade firefox-esr

firefox→ fixed in87.0-r0
```
apk update && apk add --upgrade firefox
```

librewolf→ fixed in87.0-r0

apk update && apk add --upgrade librewolf

thunderbird→ fixed in78.9.0-r0

apk update && apk add --upgrade thunderbird

Alpine edge

Source: Alpine secdb

firefox-esr→ fixed in78.9.0-r0

apk update && apk add --upgrade firefox-esr

firefox→ fixed in87.0-r0
```
apk update && apk add --upgrade firefox
```

librewolf→ fixed in87.0-r0

apk update && apk add --upgrade librewolf

thunderbird→ fixed in78.9.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.18

Source: Alpine secdb

firefox-esr→ fixed in78.9.0-r0

apk update && apk add --upgrade firefox-esr

firefox→ fixed in87.0-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in78.9.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.19

Source: Alpine secdb

firefox-esr→ fixed in78.9.0-r0

apk update && apk add --upgrade firefox-esr

firefox→ fixed in87.0-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in78.9.0-r0

apk update && apk add --upgrade thunderbird

Are YOU affected by CVE-2021-23984?

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

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