CVE-2020-12783 · cross-distro fix matrix

CVE-2020-12783: Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-12783 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

exim4→ fixed in4.93-16urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y exim4
```

Debian bookworm

Source: Debian Security Tracker

exim4→ fixed in4.93-16urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y exim4
```

Debian trixie

Source: Debian Security Tracker

exim4→ fixed in4.93-16urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y exim4
```

Alpine v3.20

Source: Alpine secdb

exim→ fixed in4.93-r1
```
apk update && apk add --upgrade exim
```

Alpine v3.21

Source: Alpine secdb

exim→ fixed in4.93-r1
```
apk update && apk add --upgrade exim
```

Alpine edge

Source: Alpine secdb

exim→ fixed in4.93-r1
```
apk update && apk add --upgrade exim
```

Alpine v3.18

Source: Alpine secdb

exim→ fixed in4.93-r1
```
apk update && apk add --upgrade exim
```

Alpine v3.19

Source: Alpine secdb

exim→ fixed in4.93-r1
```
apk update && apk add --upgrade exim
```

Are YOU affected by CVE-2020-12783?

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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Continuous monitoring beats manual checking

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