CVE-2020-6819 · cross-distro fix matrix

CVE-2020-6819: Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-6819 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

firefox-esr→ fixed in68.6.1esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:68.7.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Debian bookworm

Source: Debian Security Tracker

firefox-esr→ fixed in68.6.1esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:68.7.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Debian trixie

Source: Debian Security Tracker

firefox-esr→ fixed in68.6.1esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```
thunderbird→ fixed in1:68.7.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y thunderbird
```

Alpine v3.20

Source: Alpine secdb

firefox-esr→ fixed in68.6.1-r0

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

firefox→ fixed in74.0.1-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in68.7.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.21

Source: Alpine secdb

firefox-esr→ fixed in68.6.1-r0

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

firefox→ fixed in74.0.1-r0
```
apk update && apk add --upgrade firefox
```

librewolf→ fixed in74.0.1-r0

apk update && apk add --upgrade librewolf

thunderbird→ fixed in68.7.0-r0

apk update && apk add --upgrade thunderbird

Alpine edge

Source: Alpine secdb

firefox-esr→ fixed in68.6.1-r0

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

firefox→ fixed in74.0.1-r0
```
apk update && apk add --upgrade firefox
```

librewolf→ fixed in74.0.1-r0

apk update && apk add --upgrade librewolf

thunderbird→ fixed in68.7.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.18

Source: Alpine secdb

firefox-esr→ fixed in68.6.1-r0

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

firefox→ fixed in74.0.1-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in68.7.0-r0

apk update && apk add --upgrade thunderbird

Alpine v3.19

Source: Alpine secdb

firefox-esr→ fixed in68.6.1-r0

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

firefox→ fixed in74.0.1-r0
```
apk update && apk add --upgrade firefox
```

thunderbird→ fixed in68.7.0-r0

apk update && apk add --upgrade thunderbird

Are YOU affected by CVE-2020-6819?

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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