CVE-2021-21343 · cross-distro fix matrix

CVE-2021-21343: XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-21343 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

libxstream-java→ fixed in1.4.15-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxstream-java
```

Debian bookworm

Source: Debian Security Tracker

libxstream-java→ fixed in1.4.15-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxstream-java
```

Debian trixie

Source: Debian Security Tracker

libxstream-java→ fixed in1.4.15-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libxstream-java
```

Are YOU affected by CVE-2021-21343?

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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