CVE-2021-21191
CVSS v3
8.8
HIGH
EPSS Score
1.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Use after free in WebRTC in Google Chrome prior to 89.0.4389.90 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Technical details
- Published
- 2021-03-16
Frequently asked questions
What is CVE-2021-21191?
Use after free in WebRTC in Google Chrome prior to 89.0.4389.90 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Is CVE-2021-21191 actively exploited?
Active exploitation of CVE-2021-21191 has not been confirmed. Its EPSS score was 1.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-21191?
CVE-2021-21191 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2021-21191 affecting your environment?
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