Is CVE-2021-1799 in the CISA KEV catalog?

No. CVE-2021-1799 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1799?

CVE-2021-1799 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-1799?

CVE-2021-1799 has an EPSS score of 1.77% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1799?

Upgrade webkit2gtk on debian 11 to 2.30.6-1 or later. Fixes are available for 17 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1799

MEDIUMEPSS 75th pctl

6.5

CVSS v3

NVD

Description

A port redirection issue was addressed with additional port validation. 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. A malicious website may be able to access restricted ports on arbitrary servers.

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.30.6-1CVE-2021-1799

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

SafariWindows application

Affected:14.0.3Fixed in:14.0.3Apple 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

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.77%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Vendor Advisory5

Third-Party Advisory1

security.gentoo.org

Other references2

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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.