What is CVE-2021-33451?

CVE-2021-33451 is a medium-severity vulnerability in Long Range Zip Project, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2022-07-26.

How severe is CVE-2021-33451?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Long Range Zip Project

CVE-2021-33451

An issue was discovered in lrzip version 0.641. There are memory leaks in fill_buffer() in stream.c.

Published 2022-07-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Long Range Zip Project — versions 0.641

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

github.com/ckolivas/lrzip/issues/198 (Exploit, Third Party Advisory, Issue Tracking)
gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33451?: CVE-2021-33451 is a medium-severity vulnerability in Long Range Zip Project, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2022-07-26.
How severe is CVE-2021-33451?: Medium severity. CVSS v3 base score is 5.5 out of 10.