Is CVE-2021-30720 in the CISA KEV catalog?

No. CVE-2021-30720 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30720?

CVE-2021-30720 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-30720?

CVE-2021-30720 has an EPSS score of 1.28% (66th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30720?

Upgrade webkit2gtk on debian 11 to 2.32.3-1 or later. Fixes are available for 17 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30720

MEDIUM

5.4

CVSS v3

NVD

Description

A logic issue was addressed with improved restrictions. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Safari 14.1.1, macOS Big Sur 11.4, watchOS 7.5. A malicious website may be able to access restricted ports on arbitrary servers.

CWE-287Improper Authentication

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.32.3-1CVE-2021-30720

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-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-develRed 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

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

SafariWindows application

Affected:14.1.1Fixed in:14.1.1Apple 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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.28%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Vendor Advisory5

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	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.