Skip to content
Fencer Vulns
medium 5.5

CVE-2021-27345 json

A null pointer dereference was discovered in ucompthread in stream.c in Irzip 0.631 which allows attackers to cause a denial of service (DO…

published 2021-06-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14105

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • lrzip Debian 14, Debian 13, Debian 12 0.640-1

debian advisories DEBIAN-CVE-2021-27345

  • lrzip Ubuntu 18.04 LTS 0.631-1+deb9u3build0.18.04.1
  • lrzip Ubuntu 20.04 LTS 0.631+git180528-1+deb10u1build0.20.04.1

ubuntu advisories UBUNTU-CVE-2021-27345

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • lrzip Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 0.640-r0

alpine advisories ALPINE-CVE-2021-27345

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/ckolivas/lrzip/issues/164 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.