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Fencer Vulns
high 7.8

CVE-2021-3497 json

GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing certain malformed Matroska files.

published 2021-04-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26818

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

GStreamer before 1.18.4 might access already-freed memory in error code paths when demuxing certain malformed Matroska files.

Patch / fix

  • gstreamer gstreamer 1.18.4
  • gst-plugins-good1.0 Debian 14, Debian 13, Debian 12 1.18.4-2

debian advisories DEBIAN-CVE-2021-3497

  • gst-plugins-good1.0 Ubuntu 16.04 LTS 1.8.3-1ubuntu0.5
  • gst-plugins-good1.0 Ubuntu 18.04 LTS 1.14.5-0ubuntu1~18.04.2
  • gst-plugins-good1.0 Ubuntu 20.04 LTS 1.16.2-1ubuntu2.1

ubuntu advisories UBUNTU-CVE-2021-3497

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

  • gstreamer1-plugins-good RHEL 8 1.16.1-3.el8
  • gstreamer1-plugins-good-gtk RHEL 8 1.16.1-3.el8

red hat advisories RHSA-2022:7618

  • gstreamer-plugins-good SLES for SAP 12 SP5, SLES 12 SP5 1.8.3-16.3.1
  • gstreamer-plugins-good SLE Module for Basesystem 15 SP3, SLE Module for Basesystem 15 SP2 1.16.3-3.6.1
  • gstreamer-plugins-good SLES for SAP 15 SP1, SLES 15 SP1-LTSS 1.12.5-150000.3.7.2

suse advisories SUSE-SU-2023:3688-1SUSE-SU-2021:2916-1SUSE-SU-2021:2915-1

  • gstreamer-plugins-good openSUSE Leap 15.2 1.16.3-lp152.2.6.1
  • gstreamer-plugins-good openSUSE Leap 15.3 1.16.3-3.6.1

opensuse advisories openSUSE-SU-2021:1230-1openSUSE-SU-2021:2915-1

  • gstreamer1-plugins-good AlmaLinux 8 1.16.1-3.el8
  • gstreamer1-plugins-good-gtk AlmaLinux 8 1.16.1-3.el8

almalinux advisories ALSA-2022:7618

  • gstreamer1-plugins-good Rocky Linux 8 1.16.1-3.el8

rocky linux advisories RLSA-2022:7618

  • gstreamer Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 1.18.4-r0
  • gst-plugins-good Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 1.18.4-r0

alpine advisories ALPINE-CVE-2021-3497

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-2021-3497 updated cvss 7.8

gstreamer-plugins-good: Use-after-free in matroska demuxing

  • Red Hat Enterprise Linux 6 gstreamer-plugins-good
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 gstreamer-plugins-good, gstreamer1-plugins-good
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) gstreamer1-plugins-good 1.16.1-3.el8, gstreamer1-plugins-good-gtk 1.16.1-3.el8
    fixed: vendor fix RHSA-2022:7618
  • Red Hat Enterprise Linux 9 gstreamer1-plugins-good, gstreamer1-plugins-good-gtk
    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

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Affected products

  • n/a gstreamer-plugins-good

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.