Is CVE-2021-21779 in the CISA KEV catalog?

No. CVE-2021-21779 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21779?

CVE-2021-21779 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-21779?

CVE-2021-21779 has an EPSS score of 2.91% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21779?

Upgrade webkit2gtk on debian 11 to 2.32.3-1 or later. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21779

HIGHEPSS 85th pctl

8.8

CVSS v3

NVD

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.

CWE-416Use After Free

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.32.3-1CVE-2021-21779

webkitgtk4Red Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4Rocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-debuginfoRed Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-debuginfoRocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-develRocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-develRed Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-docRocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-docRed Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-jscRed Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-jscRocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-jsc-develRocky

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

webkitgtk4-jsc-develRed Hat / RHEL

Fixed in:0:2.48.3-2.el7_9RHSA-2025:10364

libjavascriptcoregtk-4.0-18Ubuntu

Fixed in:2.32.3-0ubuntu0.18.04.1USN-5024-1

Fixed in:2.32.3-0ubuntu0.20.04.1USN-5024-1

libwebkit2gtk-4.0-37Ubuntu

Fixed in:2.32.3-0ubuntu0.18.04.1USN-5024-1

Fixed in:2.32.3-0ubuntu0.20.04.1USN-5024-1

webkit2gtkUbuntu

Fixed in:2.32.3-0ubuntu0.18.04.1USN-5024-1

Fixed in:2.32.3-0ubuntu0.20.04.1USN-5024-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.91%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Exploit1

talosintelligence.com

Third-Party Advisory1

debian.org

Mailing List1

openwall.com

Other references2

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.