What’s Vulnerable › Vulnerabilities

CVE-2021-21806

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% 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

An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.3 x64. A specially crafted HTML web page can cause a use-after-free condition, resulting in remote code execution. The victim needs to visit a malicious web site to trigger the vulnerability.

Affected products

• Webkit: 2.30.3

References

• http://www.openwall.com/lists/oss-security/2021/07/23/1
• https://talosintelligence.com/vulnerability_reports/TALOS-2020-1214
• http://www.openwall.com/lists/oss-security/2021/07/23/1
• https://talosintelligence.com/vulnerability_reports/TALOS-2020-1214

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