CVE-2021-38644
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
- Record
CVE-2021-38644- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-25083
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
- Record
EUVD-2021-25083- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-55x8-6f5x-9xx6
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
- Record
GHSA-55x8-6f5x-9xx6- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
- Record
CVE-2021-38644- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-38644 is a high vulnerability (CVSS 7.8) in Microsoft Mpeg-2 Video Extension, published September 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.29%, the 83rd percentile. No source names a fixed version.