Is CVE-2021-3497 in the CISA KEV catalog?

No. CVE-2021-3497 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3497?

CVE-2021-3497 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-3497?

CVE-2021-3497 has an EPSS score of 1.22% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3497?

Upgrade gst-plugins-good1.0 on debian 11 to 1.18.4-2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3497

HIGH

7.8

CVSS v3

NVD

Description

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

CWE-416Use After Free

How to fix

Remediation Available

gst-plugins-good1.0Debian

Fixed in:1.18.4-2CVE-2021-3497

gst-plugins-good1.0Ubuntu

Fixed in:1.8.3-1ubuntu0.5USN-4928-1

Fixed in:1.14.5-0ubuntu1~18.04.2USN-4928-1

Fixed in:1.16.2-1ubuntu2.1USN-4928-1

gstreamer1.0-plugins-goodUbuntu

Fixed in:1.8.3-1ubuntu0.5USN-4928-1

Fixed in:1.14.5-0ubuntu1~18.04.2USN-4928-1

Fixed in:1.16.2-1ubuntu2.1USN-4928-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

1.22%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Vendor Advisory1

gstreamer.freedesktop.org

Third-Party Advisory3

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-17.