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HIGH

CVE-2020-13543

CVSS v3

8.8

HIGH

EPSS Score

3.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • accountsservice-develAlmaLinux:8all versions · fixed in 0.6.55-1.el8
  • atkmmAlmaLinux:8all versions · fixed in 2.24.2-7.el8and 2 other packages
  • cairommAlmaLinux:8all versions · fixed in 1.12.0-8.el8and 2 other packages
  • chrome-gnome-shellAlmaLinux:8all versions · fixed in 10.1-7.el8
  • dleyna-coreAlmaLinux:8all versions · fixed in 0.6.0-3.el8and 1 other package
  • enchant2AlmaLinux:8all versions · fixed in 2.2.3-3.el8and 1 other package
  • gaminAlmaLinux:8all versions · fixed in 0.1.10-32.el8and 1 other package
  • geoclue2AlmaLinux:8all versions · fixed in 2.5.5-2.el8and 3 other packages

24 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-13543 Red Hat Product Security70 products fixed · 9 known affected

    webkitgtk: use-after-free may lead to arbitrary code execution

    webkitgtk as a component of Red Hat Enterprise Linux 6 · webkitgtk-devel as a component of Red Hat Enterprise Linux 6 · webkitgtk-doc as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:10364 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: webkitgtk4 security update

  • RHSA-2021:1586 Red Hat Product Security46 products fixed

    Red Hat Security Advisory: GNOME security, bug fix, and enhancement update

Full record on NVD

Description

A code execution vulnerability exists in the WebSocket functionality of Webkit WebKitGTK 2.30.0. A specially crafted web page can trigger a use-after-free vulnerability which can lead to remote code execution. An attacker can get a user to visit a webpage to trigger this vulnerability.

Technical details

Published
2020-12-03

Frequently asked questions

What is CVE-2020-13543?

A code execution vulnerability exists in the WebSocket functionality of Webkit WebKitGTK 2.30.0. A specially crafted web page can trigger a use-after-free vulnerability which can lead to remote code execution. An attacker can get a user to visit a webpage to trigger this vulnerability.

Is CVE-2020-13543 actively exploited?

Active exploitation of CVE-2020-13543 has not been confirmed. Its EPSS score was 3.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-13543?

CVE-2020-13543 has a CVSS v3 base score of 8.8 (HIGH severity).

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