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CVE-2021-3672 · cross-distro fix matrix

CVE-2021-3672: A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as wel

Affects 8 Linux releases across 18 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-3672 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

c-ares→ fixed in1.17.1-1+deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y c-ares
```

Debian bookworm

Source: Debian Security Tracker

c-ares→ fixed in1.17.1-1.1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y c-ares
```

Debian trixie

Source: Debian Security Tracker

c-ares→ fixed in1.17.1-1.1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y c-ares
```

Alpine v3.20

Source: Alpine secdb

c-ares→ fixed in1.17.2-r0
```
apk update && apk add --upgrade c-ares
```
nodejs→ fixed in14.17.5-r0
```
apk update && apk add --upgrade nodejs
```

nodejs-current→ fixed in16.6.2-r0

apk update && apk add --upgrade nodejs-current

Alpine v3.21

Source: Alpine secdb

c-ares→ fixed in1.17.2-r0
```
apk update && apk add --upgrade c-ares
```
nodejs→ fixed in14.17.5-r0
```
apk update && apk add --upgrade nodejs
```

nodejs-current→ fixed in16.6.2-r0

apk update && apk add --upgrade nodejs-current

Alpine edge

Source: Alpine secdb

c-ares→ fixed in1.17.2-r0
```
apk update && apk add --upgrade c-ares
```
nodejs→ fixed in14.17.5-r0
```
apk update && apk add --upgrade nodejs
```

nodejs-current→ fixed in16.6.2-r0

apk update && apk add --upgrade nodejs-current

Alpine v3.18

Source: Alpine secdb

c-ares→ fixed in1.17.2-r0
```
apk update && apk add --upgrade c-ares
```
nodejs→ fixed in14.17.5-r0
```
apk update && apk add --upgrade nodejs
```

nodejs-current→ fixed in16.6.2-r0

apk update && apk add --upgrade nodejs-current

Alpine v3.19

Source: Alpine secdb

c-ares→ fixed in1.17.2-r0
```
apk update && apk add --upgrade c-ares
```
nodejs→ fixed in14.17.5-r0
```
apk update && apk add --upgrade nodejs
```

nodejs-current→ fixed in16.6.2-r0

apk update && apk add --upgrade nodejs-current

Are YOU affected by CVE-2021-3672?

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-2021-3672dropped 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.

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