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CVE-2021-3185

29
FAUCET Score

CVE-2021-3185 is a critical vulnerability in the gstreamer h264 component of freedesktop gst-plugins-bad versions prior to 1.18.1. An attacker can exploit a flaw in h264 header parsing to cause stack smashing, memory corruption, and potentially remote code execution. With a CVSS score of 9.8 (Critical), this vulnerability requires no user interaction or authentication and has low attack complexity, making it highly severe. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.18.1CPE matchmatch criteria
cpe:2.3:a:freedesktop:gst-plugins-bad:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.38%
Probability of exploitation in next 30 days
EPSS Percentile
82.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0238 is in the 72nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: gstreamer-plugins-bad-free
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: gstreamer1-plugins-bad-free

Vendor Advisories (1)

redhatCVE-2021-3185Moderate

gstreamer: buffer overflow in gst_h264_slice_parse_dec_ref_pic_marking

Sep 23, 2020

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
security.gentoo.org / glsa/202208-31
Third Party Advisory