Is CVE-2021-1789 in the CISA KEV catalog?

Yes. CVE-2021-1789 is on the CISA Known Exploited Vulnerabilities list, added 2022-05-04.

What is the CVSS severity of CVE-2021-1789?

CVE-2021-1789 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-1789?

CVE-2021-1789 has an EPSS score of 14.54% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1789?

Upgrade webkit2gtk on debian 11 to 2.30.6-1 or later. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1789

HIGHCISA KEVEPSS 96th pctl

8.8

CVSS v3

NVD

Description

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CWE-843Type Confusion

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.30.6-1CVE-2021-1789

webkitgtk4Rocky

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

webkitgtk4Red 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-debuginfoRed Hat / RHEL

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-docRed 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-jscRocky

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-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:2.30.6-0ubuntu0.18.04.1USN-4894-1

Fixed in:2.30.6-0ubuntu0.20.04.1USN-4894-1

libwebkit2gtk-4.0-37Ubuntu

Fixed in:2.30.6-0ubuntu0.18.04.1USN-4894-1

Fixed in:2.30.6-0ubuntu0.20.04.1USN-4894-1

webkit2gtkUbuntu

Fixed in:2.30.6-0ubuntu0.18.04.1USN-4894-1

Fixed in:2.30.6-0ubuntu0.20.04.1USN-4894-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

14.54%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Apple Multiple Products Type Confusion Vulnerability

A type confusion issue affecting multiple Apple products allows processing of maliciously crafted web content, leading to arbitrary code execution.

Apply updates per vendor instructions.

Remediation due: 2022-05-25

References

Vendor Advisory5

Third-Party Advisory1

security.gentoo.org

Government Resource1

cisa.gov

Mailing List2

Related Vulnerabilities

Other CWE-843 (Type Confusion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2011-0611	High	8.8	99%	KEV	Fix
CVE-2012-0507	Critical	9.8	98%	KEV + Ransom	-
CVE-2017-8291	High	7.8	97%	KEV	Fix
CVE-2019-0752	High	7.5	82%	KEV + Ransom	-
CVE-2017-0037	High	8.1	80%	KEV	-
CVE-2016-7201	High	8.8	80%	KEV	-

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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 2025-10-23.