Is CVE-2021-42762 in the CISA KEV catalog?

No. CVE-2021-42762 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42762?

CVE-2021-42762 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-42762?

CVE-2021-42762 has an EPSS score of 0.50% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42762?

Upgrade webkit2gtk on debian 11 to 2.34.1-1~deb11u1 or later. Fixes are available for 16 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42762

MEDIUM

5.3

CVSS v3

NVD

Description

BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133.

How to fix

Remediation Available

webkit2gtkDebian

Fixed in:2.34.1-1~deb11u1CVE-2021-42762

Fixed in:2.34.1-1CVE-2021-42762

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-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

libjavascriptcoregtk-4.0-18Ubuntu

Fixed in:2.34.1-0ubuntu0.20.04.1USN-5127-1

libwebkit2gtk-4.0-37Ubuntu

Fixed in:2.34.1-0ubuntu0.20.04.1USN-5127-1

webkit2gtkUbuntu

Fixed in:2.34.1-0ubuntu0.20.04.1USN-5127-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.50%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Exploit1

bugs.webkit.org

Third-Party Advisory7

Other references3

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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.