CVE-2021-28464
mediumpriority · track · 28EPSS 0.023 · 83 %ileEURUUSgrimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.25% (83rd) EPSS
CVSS 6.8 · medium
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · nvd
EPSS · scored 2026-10-27
VP9 Video Extensions Remote Code Execution Vulnerability
01
cvss
Technical severity, 0–10. One row per scoring source.
7.8
010
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.8
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 1.8 · impact 5.9
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 5.9
02
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
03
weaknesses
The CWE weakness classes this flaw belongs to.
04
affected products (3)
Products and version ranges known to be affected.
- microsoft vp9 video extensionsall versionsnvdUScpe:2.3:a:microsoft:vp9_video_extensions:*:*:*:*:*:*:*:*
05
also known as (4)
Other names and identifiers for this entity.
06
sources
Which sources assert this record, and when.
07
references (6)
External citations — patches, advisories, analysis.
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-28464cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-28464cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28464cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021041336cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28464enisa_euvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28464PatchVendor Advisorynvd
scry
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