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Fencer Intel
medium 6.5

CVE-2018-7557 json

The decode_init function in libavcodec/utvideodec.c in FFmpeg 2.8 through 3.4.2 allows remote attackers to cause a denial of service (Out o…

published 2018-02-28 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19284

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

The decode_init function in libavcodec/utvideodec.c in FFmpeg 2.8 through 3.4.2 allows remote attackers to cause a denial of service (Out of array read) via an AVI file with crafted dimensions within chroma subsampling data.

Patch / fix

  • ffmpeg Debian 14, Debian 13, Debian 12 7:3.4.3-1

debian advisories DEBIAN-CVE-2018-7557

  • ffmpeg Ubuntu 16.04 LTS 7:2.8.15-0ubuntu0.16.04.1
  • ffmpeg Ubuntu 18.04 LTS 7:3.4.4-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-7557

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

  • ffmpeg Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 3.4.3-r0
  • ffmpeg4 Alpine 3.22, Alpine 3.21, Alpine 3.20 +4 more 3.4.3-r0

alpine advisories ALPINE-CVE-2018-7557

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

Exploit prediction

1.89% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Classification

Weakness

References

Sources

Fencer Intel 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.