What is CVE-2021-4079?

CVE-2021-4079 is a high-severity vulnerability in Google Chrome, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-12-23.

How severe is CVE-2021-4079?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Google Chrome

CVE-2021-4079

Out of bounds write in WebRTC in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via crafted WebRTC packets.

Vulnerability class: Buffer Overflow

Published 2021-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.9th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000

Affected products

Google Chrome — versions unspecified
Debian Linux — versions 10.0, 11.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop.html (Release Notes, Vendor Advisory)
crbug.com/1265806 (Permissions Required)
www.debian.org/security/2022/dsa-5046 (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/202208-25 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4079?: CVE-2021-4079 is a high-severity vulnerability in Google Chrome, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-12-23.
How severe is CVE-2021-4079?: High severity. CVSS v3 base score is 8.8 out of 10.