Is CVE-2021-30849 in the CISA KEV catalog?

No. CVE-2021-30849 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30849?

CVE-2021-30849 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-30849?

CVE-2021-30849 has an EPSS score of 1.79% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30849?

Upgrade webkit2gtk on debian 11 to 2.32.4-1~deb11u1 or later. Fixes are available for 15 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30849

HIGHEPSS 76th pctl

7.8

CVSS v3

NVD

Description

Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 14.8 and iPadOS 14.8, watchOS 8, Safari 15, tvOS 15, iOS 15 and iPadOS 15, iTunes 12.12 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.32.4-1~deb11u1CVE-2021-30849

Fixed in:2.32.4-1CVE-2021-30849

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-develRed 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-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

SafariWindows application

Affected:15.0Fixed in:15.0Apple Inc.

iTunesWindows application

Affected:12.12Fixed in:12.12Apple Inc.

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.79%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Vendor Advisory8

Third-Party Advisory4

Mailing List4

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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.