What is CVE-2021-45483?

CVE-2021-45483 is a medium-severity vulnerability in Webkitgtk, classified under Use After Free. CVSS score: 6.5/10. Published 2021-12-25.

How severe is CVE-2021-45483?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Use After Free in Webkitgtk

CVE-2021-45483

In WebKitGTK before 2.32.4, there is a use-after-free in WebCore::Frame::page, a different vulnerability than CVE-2021-30889.

Vulnerability class: Use-After-Free

Published 2021-12-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Webkitgtk

Weakness classification (CWE)

CWE-416 — Use After Free

References

github.com/ChijinZ/security_advisories/tree/master/webkitgtk-2.32.3 (Exploit, Third Party Advisory)
www.openwall.com/lists/oss-security/2022/01/21/2 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45483?: CVE-2021-45483 is a medium-severity vulnerability in Webkitgtk, classified under Use After Free. CVSS score: 6.5/10. Published 2021-12-25.
How severe is CVE-2021-45483?: Medium severity. CVSS v3 base score is 6.5 out of 10.