# CVE-2021-27345: lrzip: A null pointer dereference was discovered in ucompthread in stream.c in Irzip 0.631 which allows attackers to cause a...

CVE-2021-27345 is fixed in lrzip on 1 platform, first by lrzip 0.631-1+deb9u3build0.18.04.1, released April 15, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-27345
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0072
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 10, 2021

## Description

A null pointer dereference was discovered in ucompthread in stream.c in Irzip 0.631 which allows attackers to cause a denial of service (DOS) via a crafted compressed file.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | lrzip Ubuntu 18.04.6 LTS (bionic) | 0.631-1+deb9u3build0.18.04.1 | [lrzip 0.631-1+deb9u3build0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-lrzip-0.631-1-deb9u3build0.18.04.1.md) | Apr 15, 2022 |
| Linux | lrzip Ubuntu 20.04 LTS (focal) | 0.631+git180528-1+deb10u1build0.20.04.1 | [lrzip 0.631+git180528-1+deb10u1build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-lrzip-0.631-git180528-1-deb10u1build0.20.04.1.md) | Apr 15, 2022 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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