Cyber Resilience

CVE-2021-3497

High

Published: 19 April 2021

Published
19 April 2021
Modified
17 March 2026
KEV Added
—
Patch
—
CVSS Score v3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0018 38.9th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-3497 is a high-severity Use After Free (CWE-416) vulnerability in Debian Debian Linux. Its CVSS base score is 7.8 (High).

Operationally, ranked at the 38.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-416

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

gstreamer
gstreamer
0.10.0 — 1.18.4
debian
debian linux
10.0, 9.0
redhat
enterprise linux
7.0, 8.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References