CVE-2025-66287 – This vulnerability in WebKitGTK allows attacker... (How to Fix)

Q: What is the severity of CVE-2025-66287?

CVE-2025-66287 has a CVSS score of 8.8 (HIGH). This vulnerability in WebKitGTK allows attackers to cause unexpected process crashes by exploiting improper memory handling when processing malicious web content. It affects systems running WebKitGTK-based applications like web browsers. The high CVSS score indicates significant potential impact.

📋 TL;DR

This vulnerability in WebKitGTK allows attackers to cause unexpected process crashes by exploiting improper memory handling when processing malicious web content. It affects systems running WebKitGTK-based applications like web browsers. The high CVSS score indicates significant potential impact.

💻 Affected Systems

Products:

WebKitGTK
Applications using WebKitGTK rendering engine

Versions: Specific versions referenced in Red Hat advisories (check RHSA-2025:22789 through RHSA-2025:23434)

Operating Systems: Linux distributions using WebKitGTK, particularly Red Hat Enterprise Linux and derivatives

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using vulnerable WebKitGTK versions for web content rendering is affected.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:

Review the CVE details at NVD
Check vendor security advisories for your specific version
Test if the vulnerability is exploitable in your environment
Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or ransomware deployment.

🟠

Likely Case

Denial of service through application crashes, potentially leading to system instability.

🟢

If Mitigated

Limited impact with proper sandboxing and memory protection mechanisms in place.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires user interaction with malicious web content.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Versions specified in Red Hat advisories (check specific RHSA)

Vendor Advisory: https://access.redhat.com/errata/RHSA-2025:22789

Restart Required: Yes

Instructions:

1. Identify affected WebKitGTK packages. 2. Apply updates via system package manager. 3. Restart affected applications/services.

🔧 Temporary Workarounds

Disable WebKitGTK-based applications

linux

Temporarily disable or restrict access to applications using WebKitGTK.

systemctl stop [affected-service]
chmod -x /usr/bin/[affected-app]

Network filtering

all

Block access to untrusted websites at network perimeter.

🧯 If You Can't Patch

Implement strict network segmentation to isolate vulnerable systems
Deploy application sandboxing and memory protection controls

🔍 How to Verify

Check if Vulnerable:

Check WebKitGTK package version against patched versions in Red Hat advisories.

Check Version:

rpm -q webkitgtk4 || dpkg -l | grep webkitgtk

Verify Fix Applied:

Verify WebKitGTK package version matches patched version from vendor advisory.

📡 Detection & Monitoring

Log Indicators:

Unexpected application crashes
Memory access violation logs
WebKitGTK process termination

Network Indicators:

Requests to known malicious domains serving exploit code

SIEM Query:

source="*syslog*" AND ("segmentation fault" OR "memory corruption" OR "webkitgtk")

📊 Metadata

CVE ID: CVE-2025-66287

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-120

EPSS Score: 0.07% exploit probability (21.3th percentile)

Published: December 4, 2025

Last Updated: December 22, 2025

🔗 References

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🔗 Related Vulnerabilities

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