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CVE-2021-21779

HIGHCVSS 8.8/10EPSS 2.91%

Last modified

CVE-2021-21779 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 2.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
2.91%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
WebkitgtkWebkitgtk2.30.4
FedoraprojectFedora33
FedoraprojectFedora34
DebianDebian Linux10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2021-21779?
CVE-2021-21779 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.91% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21779?
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-2021-21779?

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

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Source: NVD / NIST