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Fencer Vulns
medium 6.5

CVE-2020-21605 json

libde265 v1.0.4 contains a segmentation fault in the apply_sao_internal function, which can be exploited via a crafted a file.

published 2021-09-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-14373

cvss
6.5
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

libde265 v1.0.4 contains a segmentation fault in the apply_sao_internal function, which can be exploited via a crafted a file.

Patch / fix

  • libde265 Debian 14, Debian 13, Debian 12 1.0.9-1

debian advisories DEBIAN-CVE-2020-21605

  • libde265 Ubuntu 20.04 LTS 1.0.4-1ubuntu0.1
  • libde265 Ubuntu Pro 16.04 LTS 1.0.2-2ubuntu0.16.04.1~esm1
  • libde265 Ubuntu Pro 18.04 LTS 1.0.2-2ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2020-21605

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

  • libde265 Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 1.0.11-r0

alpine advisories ALPINE-CVE-2020-21605

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

  • libde265 Arch Linux 1.0.10-1

arch linux advisories AVG-2396

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/strukturag/libde265/issues/234 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/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

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.