CVE-2021-1644

User-assisted code execution

Published Jan 12, 2021 · Updated Oct 8, 2024

Remote code execution in Microsoft HEVC Video Extensions allows context-dependent attackers to execute code via unspecified vectors. Microsoft has not published the vulnerable decoder locus or the unsafe operation performed on untrusted input. The published assessment requires user interaction and no prior privileges, with execution confined to the affected security authority.

CVSS severity7.8
High
EPSS probability3.84%
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 HEVC Video Extensions allows context-dependent attackers to execute code via unspecified vectors. Microsoft has not published the vulnerable decoder locus or the unsafe operation performed on untrusted input. The published assessment requires user interaction and no prior privileges, with execution confined to the affected security authority.

The record

CVE
CVE-2021-1644
Published
Jan 12, 2021
Updated
Oct 8, 2024
Vendor
Microsoft
Product
HEVC Video Extensions
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 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=N/A

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · HEVC Video Extensionsversion=N/A

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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