CVE-2021-3449 · cross-distro fix matrix

CVE-2021-3449: An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a

Affects 8 Linux releases across 14 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-3449 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

openssl→ fixed in1.1.1k-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssl
```

Debian bookworm

Source: Debian Security Tracker

openssl→ fixed in1.1.1k-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssl
```

Debian trixie

Source: Debian Security Tracker

openssl→ fixed in1.1.1k-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssl
```

Alpine v3.20

Source: Alpine secdb

openssl→ fixed in1.1.1k-r0
```
apk update && apk add --upgrade openssl
```
synapse→ fixed in1.30.1-r0
```
apk update && apk add --upgrade synapse
```

Alpine v3.21

Source: Alpine secdb

openssl→ fixed in1.1.1k-r0
```
apk update && apk add --upgrade openssl
```
synapse→ fixed in1.30.1-r0
```
apk update && apk add --upgrade synapse
```

Alpine edge

Source: Alpine secdb

openssl→ fixed in1.1.1k-r0
```
apk update && apk add --upgrade openssl
```
synapse→ fixed in1.30.1-r0
```
apk update && apk add --upgrade synapse
```

Alpine v3.18

Source: Alpine secdb

openssl→ fixed in1.1.1k-r0
```
apk update && apk add --upgrade openssl
```

openssl1.1-compat→ fixed in1.1.1k-r0

apk update && apk add --upgrade openssl1.1-compat

synapse→ fixed in1.30.1-r0
```
apk update && apk add --upgrade synapse
```

Alpine v3.19

Source: Alpine secdb

openssl→ fixed in1.1.1k-r0
```
apk update && apk add --upgrade openssl
```
synapse→ fixed in1.30.1-r0
```
apk update && apk add --upgrade synapse
```

Are YOU affected by CVE-2021-3449?

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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