CVE-2021-33453 json
An issue was discovered in lrzip version 0.641.
published 2022-07-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20157
- cvss
- 7.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ckolivas/lrzip/issues/199 referenced PoC, tagged "exploit" by a source, unverified
- gist.github.com https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/ckolivas/lrzip/issues/199
exploit, issue-tracking, third-party-advisory
-
gist.github.com
/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d
exploit, third-party-advisory
Sources
- CVE List CVE-2021-33453
- NVD CVE-2021-33453
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.