Use After Free in Webkitgtk
CVE-2021-21779
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.
Vulnerability class: Use-After-Free
EPSS: 0.029 (85.6th percentile) — read the EPSS interpretation.
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.
Affected products
- Webkitgtk — versions 2.30.4
- Debian Debian_linux — versions 10.0
- Fedoraproject Fedora — versions 33, 34
- N/a Webkit — versions Webkit WebKitGTK 2.30.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- talos-cna@cisco.com (Exploit, Third Party Advisory, x_refsource_MISC)
- talos-cna@cisco.com (mailing-list, x_refsource_MLIST, Mailing List)
- talos-cna@cisco.com (x_refsource_FEDORA, vendor-advisory)
- talos-cna@cisco.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- talos-cna@cisco.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-21779?
- CVE-2021-21779 is a high-severity vulnerability in Webkitgtk, classified under Use After Free. CVSS score: 8.8/10. Published 2021-07-08.
- How severe is CVE-2021-21779?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-21779 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.