CVE-2024-2614 – This CVE describes memory safety bugs in Firefo... (How to Fix)

Q: How do I fix CVE-2024-2614?

1. Open Firefox/Thunderbird. 2. Click menu → Help → About Firefox/Thunderbird. 3. Allow automatic update to complete. 4. Restart the application when prompted.

Q: What is the severity of CVE-2024-2614?

CVE-2024-2614 has a CVSS score of 8.8 (HIGH). This CVE describes memory safety bugs in Firefox, Firefox ESR, and Thunderbird that could lead to memory corruption. With sufficient effort, attackers could potentially exploit these vulnerabilities to execute arbitrary code on affected systems. All users running Firefox versions below 124, Firefox ESR below 115.9, or Thunderbird below 115.9 are vulnerable.

📋 TL;DR

This CVE describes memory safety bugs in Firefox, Firefox ESR, and Thunderbird that could lead to memory corruption. With sufficient effort, attackers could potentially exploit these vulnerabilities to execute arbitrary code on affected systems. All users running Firefox versions below 124, Firefox ESR below 115.9, or Thunderbird below 115.9 are vulnerable.

💻 Affected Systems

Products:

Mozilla Firefox
Mozilla Firefox ESR
Mozilla Thunderbird

Versions: Firefox < 124, Firefox ESR < 115.9, Thunderbird < 115.9

Operating Systems: All supported operating systems (Windows, macOS, Linux)

Default Config Vulnerable: ⚠️ Yes

Notes: All standard installations are vulnerable. No special configuration required for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

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

🟠

Likely Case

Browser/application crash (denial of service) with potential for limited code execution in some scenarios.

🟢

If Mitigated

No impact if systems are patched or isolated from untrusted content.

🌐 Internet-Facing: HIGH - Web browsers and email clients frequently process untrusted content from the internet.

🏢 Internal Only: MEDIUM - Internal users could be targeted via malicious internal websites or emails.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Memory corruption vulnerabilities require specific conditions to achieve reliable exploitation, but browser-based attacks can be delivered via malicious websites or emails without user authentication.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firefox 124+, Firefox ESR 115.9+, Thunderbird 115.9+

Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-12/

Restart Required: Yes

Instructions:

1. Open Firefox/Thunderbird. 2. Click menu → Help → About Firefox/Thunderbird. 3. Allow automatic update to complete. 4. Restart the application when prompted.

🔧 Temporary Workarounds

Disable JavaScript

all

Reduces attack surface by preventing JavaScript execution, which is commonly used to trigger memory corruption vulnerabilities.

about:config → javascript.enabled = false

Use Content Security Policy

all

Implement CSP headers to restrict script execution from untrusted sources.

Content-Security-Policy: script-src 'self'

🧯 If You Can't Patch

Isolate vulnerable systems from internet access and untrusted internal networks.
Implement application whitelisting to prevent execution of unauthorized code.

🔍 How to Verify

Check if Vulnerable:

Check application version in Help → About Firefox/Thunderbird. If version is below Firefox 124, Firefox ESR 115.9, or Thunderbird 115.9, system is vulnerable.

Check Version:

firefox --version | thunderbird --version

Verify Fix Applied:

Confirm version is Firefox 124+, Firefox ESR 115.9+, or Thunderbird 115.9+ in Help → About menu.

📡 Detection & Monitoring

Log Indicators:

Application crash logs with memory access violation errors
Unexpected process termination of Firefox/Thunderbird

Network Indicators:

Unusual outbound connections from browser/email client processes
Traffic to known exploit hosting domains

SIEM Query:

process_name IN ('firefox.exe', 'thunderbird.exe') AND event_type='crash'

📊 Metadata

CVE ID: CVE-2024-2614

CVSS v3 Score: 8.8 (HIGH)

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

CWE: CWE-787

Published: March 19, 2024

Last Updated: February 25, 2025

🔗 References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685358%2C1861016%2C1880405%2C1881093 Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html Mailing List,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html Mailing List,Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2024-12/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-14/ Vendor Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685358%2C1861016%2C1880405%2C1881093 Issue Tracking
https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html Mailing List,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html Mailing List,Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2024-12/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-14/ Vendor Advisory

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🔗 Related Vulnerabilities

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