CVE-2025-11710
📋 TL;DR
This vulnerability allows a compromised web process to send malicious IPC messages that cause the privileged browser process to leak memory contents. Attackers could potentially access sensitive information from browser memory. Affects Firefox, Firefox ESR, and Thunderbird users running vulnerable versions.
💻 Affected Systems
- Firefox
- Firefox ESR
- Thunderbird
📦 What is this software?
Firefox by Mozilla
Firefox by Mozilla
Firefox by Mozilla
Thunderbird by Mozilla
Thunderbird by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of browser memory leading to exposure of sensitive data including passwords, session tokens, encryption keys, and other confidential information stored in memory.
Likely Case
Information disclosure where attackers can read portions of browser memory, potentially exposing user data, authentication tokens, or other sensitive information.
If Mitigated
Limited information exposure with proper sandboxing and process isolation, though some memory leakage may still occur.
🎯 Exploit Status
Exploitation requires compromising a web process first, then using IPC messages to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, Thunderbird 140.4
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2025-81/
Restart Required: Yes
Instructions:
1. Open the affected application. 2. Go to Help > About Firefox/Thunderbird. 3. Allow the application to check for updates. 4. Install available updates. 5. Restart the application.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents web content from executing JavaScript that could compromise web processes
about:config -> javascript.enabled = false
Use Enhanced Tracking Protection Strict Mode
allBlocks more trackers and potentially malicious content
Settings > Privacy & Security > Enhanced Tracking Protection > Strict
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only
- Implement application whitelisting to prevent execution of vulnerable versions
🔍 How to Verify
Check if Vulnerable:
Check the application version in Help > About Firefox/Thunderbird and compare with affected versionsCheck Version:
firefox --version or thunderbird --versionVerify Fix Applied:
Verify version is equal to or greater than patched versions: Firefox 144+, Firefox ESR 115.29+, Firefox ESR 140.4+, Thunderbird 144+, Thunderbird 140.4+📡 Detection & Monitoring
Log Indicators:
- Unusual IPC message patterns
- Memory access violations in browser process logs
- Abnormal process behavior
Network Indicators:
- Connections to known malicious domains that could deliver exploit code
SIEM Query:
source="firefox.log" OR source="thunderbird.log" AND (event="IPC_ERROR" OR event="MEMORY_ACCESS_VIOLATION")🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1989899
- https://www.mozilla.org/security/advisories/mfsa2025-81/
- https://www.mozilla.org/security/advisories/mfsa2025-82/
- https://www.mozilla.org/security/advisories/mfsa2025-83/
- https://www.mozilla.org/security/advisories/mfsa2025-84/
- https://www.mozilla.org/security/advisories/mfsa2025-85/
- https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html
