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Fencer Vulns
high 7.8

CVE-2021-45910 json

An issue was discovered in gif2apng 1.9.

published 2021-12-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32625

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow within the main function. It allows an attacker to write data outside of the allocated buffer. The attacker has control over a part of the address that data is written to, control over the written data, and (to some extent) control over the amount of data that is written.

Patch / fix

  • gif2apng Debian 11 1.9+srconly-3+deb11u1

debian advisories DEBIAN-CVE-2021-45910

  • gif2apng Ubuntu 18.04 LTS 1.9+srconly-2ubuntu0.1
  • gif2apng Ubuntu 20.04 LTS 1.9+srconly-3ubuntu0.1
  • gif2apng Ubuntu Pro 16.04 LTS 1.7-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-45910

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.debian.org https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1002667 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
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

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.