CVE-2021-43243

Name: CVE-2021-43243
Creator: NVD / NIST
Published: 2021-12-15T15:15:10.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.77%

Last modified Jun 17, 2026

CVE-2021-43243 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. VP9 Video Extensions Information Disclosure Vulnerability. EPSS estimates a 0.77% chance of exploitation in the next 30 days.

Description

VP9 Video Extensions Information Disclosure Vulnerability

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.77%

50.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Vp9 Video Extensions	All versions

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43243Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43243Patch, Vendor Advisory

Timeline

Published: Dec 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43243?

VP9 Video Extensions Information Disclosure Vulnerability

How severe is CVE-2021-43243?

CVE-2021-43243 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43243?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43243?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST