CVE-2021-25217 · cross-distro fix matrix

CVE-2021-25217: In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in

Affects 6 Linux releases across 6 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-25217 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

isc-dhcp→ fixed in4.4.1-2.3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y isc-dhcp
```

Debian bookworm

Source: Debian Security Tracker

isc-dhcp→ fixed in4.4.1-2.3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y isc-dhcp
```

Debian trixie

Source: Debian Security Tracker

isc-dhcp→ fixed in4.4.1-2.3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y isc-dhcp
```

Alpine v3.20

Source: Alpine secdb

dhcp→ fixed in4.4.2_p1-r0
```
apk update && apk add --upgrade dhcp
```

Alpine v3.18

Source: Alpine secdb

dhcp→ fixed in4.4.2_p1-r0
```
apk update && apk add --upgrade dhcp
```

Alpine v3.19

Source: Alpine secdb

dhcp→ fixed in4.4.2_p1-r0
```
apk update && apk add --upgrade dhcp
```

Are YOU affected by CVE-2021-25217?

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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