What’s Vulnerable › Vulnerabilities

CVE-2021-43243: VP9 Video Extensions Information Disclosure Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17

Description

VP9 Video Extensions Information Disclosure Vulnerability

Affected products

• Microsoft VP9 Video Extensions: all versions
• Microsoft VP9 Video Extensions: all versions

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43243
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43243

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