What’s Vulnerable › Vulnerabilities

CVE-2021-28465: Web Media Extensions Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-787

Description

Web Media Extensions Remote Code Execution Vulnerability

Affected products

• Microsoft Web Media Extensions: all versions
• Microsoft Web Media Extensions: from 1.0.0.0 before 1.0.40831.0 — fixed in 1.0.40831.0

How to fix

Upgrade to a fixed version: Microsoft Web Media Extensions 1.0.40831.0. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28465
• https://www.zerodayinitiative.com/advisories/ZDI-21-572/
• https://www.zerodayinitiative.com/advisories/ZDI-21-579/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28465
• https://www.zerodayinitiative.com/advisories/ZDI-21-572/
• https://www.zerodayinitiative.com/advisories/ZDI-21-579/

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