CVE-2021-25215 · cross-distro fix matrix

CVE-2021-25215: In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record tri

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

Elevated exploitation risk

FIRST EPSS puts CVE-2021-25215's probability of exploitation in the next 30 days at 11% (95th percentile of all CVEs)— well above the noise floor. Prioritize it.

EPSS:11% · 30-day exploit probability95th percentile

Fix per ecosystem

Each block below is a distro release where CVE-2021-25215 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

bind9→ fixed in1:9.16.15-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```

Debian bookworm

Source: Debian Security Tracker

bind9→ fixed in1:9.16.15-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```

Debian trixie

Source: Debian Security Tracker

bind9→ fixed in1:9.16.15-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```

Alpine v3.20

Source: Alpine secdb

bind→ fixed in9.16.15-r0
```
apk update && apk add --upgrade bind
```

Alpine v3.21

Source: Alpine secdb

bind→ fixed in9.16.15-r0
```
apk update && apk add --upgrade bind
```

Alpine edge

Source: Alpine secdb

bind→ fixed in9.16.15-r0
```
apk update && apk add --upgrade bind
```

Alpine v3.18

Source: Alpine secdb

bind→ fixed in9.16.15-r0
```
apk update && apk add --upgrade bind
```

Alpine v3.19

Source: Alpine secdb

bind→ fixed in9.16.15-r0
```
apk update && apk add --upgrade bind
```

Are YOU affected by CVE-2021-25215?

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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