What’s Vulnerable › Vulnerabilities

CVE-2021-21779

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-08 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free vulnerability exists in the way Webkit’s GraphicsContext handles certain events in WebKitGTK 2.30.4. A specially crafted web page can lead to a potential information leak and further memory corruption. A victim must be tricked into visiting a malicious web page to trigger this vulnerability.

Affected products

• Debian Linux: 10.0
• Fedoraproject Fedora: 33, 34
• Webkit: 2.30.4

References

• http://www.openwall.com/lists/oss-security/2021/07/23/1
• 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-2021-1238
• https://www.debian.org/security/2021/dsa-4945
• http://www.openwall.com/lists/oss-security/2021/07/23/1
• 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-2021-1238
• https://www.debian.org/security/2021/dsa-4945

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