CVE-2020-25681 · cross-distro fix matrix

CVE-2020-25681: A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-25681 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

dnsmasq→ fixed in2.83-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```

Debian bookworm

Source: Debian Security Tracker

dnsmasq→ fixed in2.83-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```

Debian trixie

Source: Debian Security Tracker

dnsmasq→ fixed in2.83-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```

Alpine v3.20

Source: Alpine secdb

dnsmasq→ fixed in2.83-r0
```
apk update && apk add --upgrade dnsmasq
```

Alpine v3.21

Source: Alpine secdb

dnsmasq→ fixed in2.83-r0
```
apk update && apk add --upgrade dnsmasq
```

Alpine edge

Source: Alpine secdb

dnsmasq→ fixed in2.83-r0
```
apk update && apk add --upgrade dnsmasq
```

Alpine v3.18

Source: Alpine secdb

dnsmasq→ fixed in2.83-r0
```
apk update && apk add --upgrade dnsmasq
```

Alpine v3.19

Source: Alpine secdb

dnsmasq→ fixed in2.83-r0
```
apk update && apk add --upgrade dnsmasq
```

Are YOU affected by CVE-2020-25681?

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.

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