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Fencer Vulns
medium 5.5

CVE-2019-20633 json

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 den…

published 2020-03-25 6 y ago modified 2026-07-25 3 mo ago also EUVD-2019-11172 , JLSEC-2026-18

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia patch_jll 2.8.0+0
  • patch Linux Micro 6.0 2.7.6-3.1
  • patch SLE Module for Basesystem 15 SP6, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.6 +1 more 2.7.6-150000.5.6.1
  • patch SLES for SAP 12 SP5, SLES 12 SP5 2.7.5-8.11.1

suse advisories SUSE-SU-2025:20075-1SUSE-SU-2024:2780-1SUSE-SU-2024:2704-1

  • patch openSUSE Tumbleweed 2.7.6-8.1

opensuse advisories openSUSE-SU-2024:14239-1

  • patch Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 2.7.6-r7

alpine advisories ALPINE-CVE-2019-20633

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-20633 updated cvss 3.3

patch: double free in another_hunk function in pch.c

  • Red Hat Enterprise Linux 5 patch Red Hat Enterprise Linux 6 patch
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 patch Red Hat Enterprise Linux 8 patch
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • savannah.gnu.org https://savannah.gnu.org/bugs/index.php?56683 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
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia patch_jll
<2.8.0+0
2.8.0+0

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.