Double Free in GNU Patch

CVE-2019-20633

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

Vulnerability class: Double Free

Published · last modified .

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: 0.010 (62.4th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2019-20633: held from 0.010 to 0.010.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2019-20633?
CVE-2019-20633 is a medium-severity vulnerability in GNU Patch, classified under Double Free. CVSS score: 5.5/10. Published 2020-03-25.
How severe is CVE-2019-20633?
Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2019-20633 known to be exploited?
3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.