WebKit Memory Corruption Remote Code Execution Vulnerability (CVE-2019-8720, CISA KEV Listed)
Executive & SecOps Summary
SECOPS ASSESSMENTBrowsers and applications utilizing WebKit and WebKitGTK engines prior to WSA-2019-0005
Processing maliciously crafted web content can trigger memory corruption (CWE-119), potentially leading to arbitrary remote code execution (RCE)
Upgrade WebKitGTK packages to the latest stable release and restrict access to untrusted web domains
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Update the WebKitGTK packages to the latest secure versions using the system package manager.
# For RedHat/CentOS-based systems
sudo yum update -y webkit2gtk3
# For Debian/Ubuntu-based systems
sudo apt-get update && sudo apt-get install --only-upgrade -y libwebkit2gtk-4.0-372. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict outbound network access for applications utilizing WebKit or isolate the rendering processes.
# Example: Restricting outbound traffic for a specific rendering user/process using iptables
sudo iptables -A OUTPUT -m owner --uid-owner webkit-user -j REJECT3. Log Audit & IoC Verification Commands
Use the following script to audit the installed WebKitGTK version on your Linux servers to verify vulnerability status.
# Check installed WebKitGTK version to verify patch status
if command -v dpkg >/dev/null 2>&1; then
echo 'Checking Debian/Ubuntu packages:'
dpkg -l | grep -E 'webkit2gtk|libwebkit'
elif command -v rpm >/dev/null 2>&1; then
echo 'Checking RHEL/CentOS packages:'
rpm -qa | grep -E 'webkit2gtk|libwebkit'
else
echo 'No standard package manager found. Please manually verify WebKit shared library versions.'
fiBlock Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-8720) is a critical memory corruption flaw within the WebKit and WebKitGTK browser engines. The root cause lies in improper memory handling during the processing of web content, leading to memory corruption issues such as buffer overflows or use-after-free conditions (CWE-119).
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by hosting a specially crafted web page containing malicious HTML, CSS, or JavaScript. When a victim visits the malicious site using a vulnerable WebKit-based browser or embedded web view, the engine fails to safely parse the content, corrupting system memory. This allows the attacker to hijack the control flow and execute arbitrary code within the context of the application process.
3. Infrastructure & Business Impact
As this vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, it represents an active threat with confirmed in-the-wild exploitation. Successful exploitation can compromise endpoints, embedded systems, and servers running WebKit-based renderers, potentially leading to data exfiltration, lateral movement, and full system compromise.
Official Vendor Advisories & References
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.
Frequently Asked SecOps Questions (CVE-2019-8720)
FAQQ1. How critical is CVE-2019-8720 and is it actively exploited in the wild?
CVE-2019-8720 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 1.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-8720?
Primary impacted vendors include apple, webkitgtk, redhat across webkit, webkitgtk. Scope summary: WebKitGTK versions prior to 2.26.0 and applications embedding vulnerable WebKit rendering engines
Q3. What temporary mitigations or workarounds exist for CVE-2019-8720 before patching?
[Mitigation] Upgrade WebKitGTK packages to the latest stable release and restrict access to untrusted web domains Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2019-8720
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (apple)
View Category →Apple iOS, macOS, and watchOS Memory Corruption Arbitrary Code Execution Vulnerability (CVE-2026-20700)
[Affected Scope] Apple devices running iOS before 26.3, iPadOS before 26.3, macOS Tahoe before 26.3, tvOS before 26.3, visionOS before 26.3, and watchOS before 26.3
Apple macOS Screen Sharing Authentication Bypass Vulnerability (CVE-2026-65400)
[Affected Scope] macOS systems running versions prior to Sequoia 15.7.9, Sonoma 14.8.9, Tahoe 26.6.1/26.7, or Golden Gate 27 with Screen Sharing or VNC services enabled
Apple iOS and macOS Out-of-bounds Write Remote Code Execution Vulnerability (CVE-2026-86950) Security Advisory
[Affected Scope] All Apple devices running versions prior to iOS 18.7.11/26.7.1 and macOS Sequoia 15.8.1/Tahoe 26.7.1.
GNOME json-glib Infinite Loop Denial of Service Vulnerability (CVE-2026-120194) Technical Advisory
[Affected Scope] Applications and systems utilizing the GNOME json-glib library to evaluate user-controlled JSONPath queries via json_path_query()
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.