CVE-2021-21775

Name: CVE-2021-21775
Creator: NVD / NIST
Published: 2021-07-07T22:15:07.96+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2021-21775 is a high-severity vulnerability rated 8/10 on the CVSS scale. A use-after-free vulnerability exists in the way certain events are processed for ImageLoader objects of Webkit WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

Description

A use-after-free vulnerability exists in the way certain events are processed for ImageLoader objects of Webkit WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. In order to trigger the vulnerability, a victim must be tricked into visiting a malicious webpage.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

1.27%

66.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Webkitgtk	Webkitgtk	2.30.4
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Debian	Debian Linux	10.0

References

http://www.openwall.com/lists/oss-security/2021/07/23/1Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1229Exploit, Technical Description, Third Party Advisory
https://www.debian.org/security/2021/dsa-4945Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/23/1Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KYMMBQN4PRVDLMIJT2LY2BWHLYBD57P3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4QORERLPDN3UNNJFJSOMHZZCU2G75Q6/
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1229Exploit, Technical Description, Third Party Advisory
https://www.debian.org/security/2021/dsa-4945Third Party Advisory

Timeline

Published: Jul 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21775?

How severe is CVE-2021-21775?

CVE-2021-21775 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21775?

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-2021-21775?

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

Scan your code now

Source: NVD / NIST