What is CVE-2020-13753?

CVE-2020-13753 is a critical-severity vulnerability in Webkitgtk, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2020-07-14.

How severe is CVE-2020-13753?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Is CVE-2020-13753 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Webkitgtk

CVE-2020-13753

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-07-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.033 (87.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000

Affected products

Webkitgtk
Wpewebkit Wpe Webkit
Canonical Ubuntu Linux — versions 18.04, 19.10, 20.04
Debian Linux — versions 10.0
Fedoraproject Fedora — versions 31
openSUSE Leap — versions 15.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

trac.webkit.org/changeset/262368/webkit (Patch, Vendor Advisory)
www.openwall.com/lists/oss-security/2020/07/10/1 (Mailing List, Third Party Advisory)
www.debian.org/security/2020/dsa-4724 (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
usn.ubuntu.com/4422-1/ (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-07/msg00074.html (vendor-advisory, Mailing List, Third Party Advisory)
security.gentoo.org/glsa/202007-11 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-13753?: CVE-2020-13753 is a critical-severity vulnerability in Webkitgtk, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2020-07-14.
How severe is CVE-2020-13753?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2020-13753 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.