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Vulnerability record · CVE-2021-28465 · published 11 May 2021
CVE-2021-28465: Microsoft web media extensions out-of-bounds write vulnerability
Microsoft · Web Media Extensions
Web Media Extensions Remote Code Execution Vulnerability
7.8 CVSS 3.1 High EPSS 3.7% · top 10.8% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 6.8
3.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD
Description
Web Media Extensions Remote Code Execution Vulnerability
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28465 | PatchVendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-572/ | Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-579/ | Third Party Advisory |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28465 | PatchVendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-572/ | Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-579/ | Third Party Advisory |
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Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
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Source: NIST National Vulnerability Database (record CVE-2021-28465), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.
