What is CVE-2019-8720?

CVE-2019-8720 is a high-severity vulnerability in Webkitgtk, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2023-03-06.

How severe is CVE-2019-8720?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2019-8720 known to be exploited?

Yes. CVE-2019-8720 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Buffer overflow in Webkitgtk

CVE-2019-8720

A vulnerability was found in WebKit. The flaw is triggered when processing maliciously crafted web content that may lead to arbitrary code execution. Improved memory handling addresses the multiple memory corruption issues.

Vulnerability class: Buffer Overflow

Published 2023-03-06 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Webkitgtk
Wpewebkit Wpe Webkit
Red Hat Codeready Linux Builder — versions 8.0
Red Hat Codeready Linux Builder Eus — versions 8.4, 8.6
Red Hat Codeready Linux Builder For Arm64 Eus — versions 8.0, 8.4, 8.6
Red Hat Codeready Linux Builder For IBM Z Systems Eus — versions 8.0, 8.4, 8.6
Red Hat Codeready Linux Builder For Power Little Endian Eus — versions 8.0, 8.4, 8.6
Red Hat Enterprise Linux — versions 8.0
Red Hat Enterprise Linux Desktop — versions 7.0
Red Hat Enterprise Linux Eus — versions 8.4, 8.6

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-23. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-06-13.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
webkitgtk.org/security/WSA-2019-0005.html (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2019-8720?: CVE-2019-8720 is a high-severity vulnerability in Webkitgtk, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2023-03-06.
How severe is CVE-2019-8720?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2019-8720 known to be exploited?: Yes. CVE-2019-8720 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.