Skip to content
Fencer Vulns
critical 10.0

CVE-2020-13753 json

The bubblewrap sandbox of WebKitGTK and WPE WebKit, prior to 2.28.3, failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl.

published 2020-07-14 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-5974

cvss
10.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

The bubblewrap sandbox of WebKitGTK and WPE WebKit, prior to 2.28.3, failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl. CLONE_NEWUSER could potentially be used to confuse xdg-desktop-portal, which allows access outside the sandbox. TIOCSTI can be used to directly execute commands outside the sandbox by writing to the controlling terminal's input buffer, similar to CVE-2017-5226.

Patch / fix

  • webkitgtk webkitgtk 2.28.3
  • wpewebkit wpe_webkit 2.28.3
  • wpewebkit Debian 14, Debian 13, Debian 12 2.28.3-1
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.28.3-1

debian advisories DEBIAN-CVE-2020-13753

  • webkit2gtk Ubuntu 18.04 LTS 2.28.3-0ubuntu0.18.04.1
  • webkit2gtk Ubuntu 20.04 LTS 2.28.3-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-13753

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • webkitgtk4 RHEL 7 ELS 2.48.3-2.el7_9
  • webkitgtk4-jsc RHEL 7 ELS 2.48.3-2.el7_9

red hat advisories RHSA-2025:10364

  • webkit2gtk3 SLES 15 SP2-BCL, SLE Real Time 15 SP2, SLE Module for Desktop Applications 15 SP3 +9 more 2.34.3-23.3
  • webkit2gtk3 SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 2.34.3-3.92.1
  • webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 2.34.3-2.82.1
  • webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 2.28.3-2.56.1
  • webkit2gtk3 SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP2 2.28.3-3.3.1
  • webkit2gtk3 SLES for SAP 15, SLES 15-LTSS, SLE Module for Desktop Applications 15 SP1 +3 more 2.28.3-3.57.2

suse advisories SUSE-SU-2022:0182-2SUSE-SU-2022:0183-1SUSE-SU-2022:0182-1SUSE-SU-2022:0142-1SUSE-SU-2020:2069-1SUSE-SU-2020:1992-1

  • gtk3 openSUSE Tumbleweed 2.32.4-1.1
  • webkit2gtk3 openSUSE Leap 15.3 2.34.3-23.3
  • webkit2gtk3 openSUSE Leap 15.1 2.28.3-lp151.2.21.1

opensuse advisories openSUSE-SU-2024:11506-1openSUSE-SU-2022:0182-1openSUSE-SU-2020:1064-1

  • webkit2gtk Alpine 3.20, Alpine 3.19, Alpine 3.18 +6 more 2.28.3-r0

alpine advisories ALPINE-CVE-2020-13753

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-13753 updated cvss 10.0

webkitgtk: Improper access management to CLONE_NEWUSER and the TIOCSTI ioctl

  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.48.3-2.el7_9, webkitgtk4-jsc 2.48.3-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.48.3-2.el7_9, webkitgtk4-devel 2.48.3-2.el7_9, webkitgtk4-debuginfo 2.48.3-2.el7_9, webkitgtk4-jsc-devel 2.48.3-2.el7_9
    fixed: vendor fix RHSA-2025:10364
  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk Red Hat Enterprise Linux 8 webkit2gtk3, webkit2gtk3-jsc, webkit2gtk3-plugin-process-gtk2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.27% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.