CVE-2021-31967

Code execution through VP9 media processing

Published Jun 8, 2021 · Updated Aug 3, 2024

Remote code execution in Microsoft VP9 Video Extensions before 1.0.41182.0 allows attackers to execute code through VP9 media. Microsoft has not published the affected decoder locus or the incorrect operation performed on untrusted media data. Exploitation requires user interaction with content handled by the codec and results in code execution rather than a codec-only playback failure.

CVSS severity7.8
High
EPSS probability2.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft VP9 Video Extensions before 1.0.41182.0 allows attackers to execute code through VP9 media. Microsoft has not published the affected decoder locus or the incorrect operation performed on untrusted media data. Exploitation requires user interaction with content handled by the codec and results in code execution rather than a codec-only playback failure.

The record

CVE
CVE-2021-31967
Published
Jun 8, 2021
Updated
Aug 3, 2024
Vendor
Microsoft
Product
VP9 Video Extensions
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0.0 <1.0.41182.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · VP9 Video Extensionsversion=1.0.0.0 <1.0.41182.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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