CVE-2020-25721 · cross-distro fix matrix

CVE-2020-25721: Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-25721 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

samba→ fixed in2:4.13.13+dfsg-1~deb11u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y samba
```

Debian bookworm

Source: Debian Security Tracker

samba→ fixed in2:4.13.14+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y samba
```

Debian trixie

Source: Debian Security Tracker

samba→ fixed in2:4.13.14+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y samba
```

Alpine v3.20

Source: Alpine secdb

samba→ fixed in4.15.2-r0
```
apk update && apk add --upgrade samba
```

Alpine v3.21

Source: Alpine secdb

samba→ fixed in4.15.2-r0
```
apk update && apk add --upgrade samba
```

Alpine edge

Source: Alpine secdb

samba→ fixed in4.15.2-r0
```
apk update && apk add --upgrade samba
```

Alpine v3.18

Source: Alpine secdb

samba→ fixed in4.15.2-r0
```
apk update && apk add --upgrade samba
```

Alpine v3.19

Source: Alpine secdb

samba→ fixed in4.15.2-r0
```
apk update && apk add --upgrade samba
```

Are YOU affected by CVE-2020-25721?

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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