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Fencer Vulns
medium 5.5

CVE-2021-45261 json

An Invalid Pointer vulnerability exists in GNU patch 2.7 via the another_hunk function, which causes a Denial of Service.

published 2021-12-22 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32041

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

An Invalid Pointer vulnerability exists in GNU patch 2.7 via the another_hunk function, which causes a Denial of Service.

Patch / fix

  • patch Linux Micro 6.0 2.7.6-4.1
  • patch Linux Micro 6.1 2.7.6-slfo.1.1_2.1
  • patch SLE Module for Basesystem 15 SP7, openSUSE Leap 15.6 2.7.6-150000.5.9.1
  • patch SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.7.6-160000.3.1
  • patch SLES LTSS Extended Security 12 SP5 2.7.5-8.14.1

suse advisories SUSE-SU-2026:23210-1SUSE-SU-2026:22905-1SUSE-SU-2026:2922-1SUSE-SU-2026:0781-1SUSE-SU-2026:20343-1SUSE-SU-2026:20431-1

  • patch openSUSE Leap 16.0 2.7.6-160000.3.1
  • patch openSUSE Tumbleweed 2.8-2.1

opensuse advisories openSUSE-SU-2026:20227-1openSUSE-SU-2026:10140-1

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-2021-45261 updated cvss 5.5

patch: Invalid Pointer via another_hunk function

  • Red Hat Enterprise Linux 7 patch
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 patch Red Hat Enterprise Linux 9 patch
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 patch
    not affected: vulnerable code not present

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

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • savannah.gnu.org https://savannah.gnu.org/bugs/?61685 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
  • CWE-763 Release of Invalid Pointer or Reference

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.