CVE-2025-1930
📋 TL;DR
A use-after-free vulnerability in Firefox and Thunderbird on Windows allows a compromised content process to send malicious AudioIPC StreamData to the browser process, potentially leading to memory corruption and sandbox escape. This affects Firefox versions below 136, Firefox ESR below 115.21 and 128.8, and Thunderbird below 136 and 128.8. Attackers could exploit this to execute arbitrary code with browser process privileges.
💻 Affected Systems
- Mozilla Firefox
- Mozilla Firefox ESR
- Mozilla 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
Full sandbox escape leading to arbitrary code execution with browser process privileges, potentially compromising the entire Windows system.
Likely Case
Browser process compromise allowing data theft, session hijacking, and installation of malware or backdoors.
If Mitigated
Limited impact if sandboxing is properly configured and other security controls prevent initial content process compromise.
🎯 Exploit Status
Requires initial content process compromise, but then allows unauthenticated exploitation via AudioIPC. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, Thunderbird 128.8
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2025-14/
Restart Required: Yes
Instructions:
1. Open Firefox/Thunderbird. 2. Click menu → Help → About Firefox/Thunderbird. 3. Allow automatic update check and installation. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable AudioIPC (Not Recommended)
windowsDisabling AudioIPC may break audio functionality but could mitigate the vulnerability
Not available - would require code modification
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only
- Implement application whitelisting to prevent execution of compromised browser processes
🔍 How to Verify
Check if Vulnerable:
Check browser version in Help → About Firefox/Thunderbird and compare with affected versions.Check Version:
firefox --version or thunderbird --versionVerify Fix Applied:
Verify version is equal to or greater than Firefox 136, Firefox ESR 115.21/128.8, Thunderbird 136/128.8.📡 Detection & Monitoring
Log Indicators:
- Unusual AudioIPC errors
- Browser process crashes with memory access violations
- Sandbox violation alerts
Network Indicators:
- Unusual AudioIPC traffic patterns
- Suspicious web content triggering audio processing
SIEM Query:
EventID=1000 OR EventID=1001 SourceName=Firefox OR SourceName=Thunderbird AND (ExceptionCode=0xc0000005 OR ExceptionCode=0xc0000374)🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1902309
- https://www.mozilla.org/security/advisories/mfsa2025-14/
- https://www.mozilla.org/security/advisories/mfsa2025-15/
- https://www.mozilla.org/security/advisories/mfsa2025-16/
- https://www.mozilla.org/security/advisories/mfsa2025-17/
- https://www.mozilla.org/security/advisories/mfsa2025-18/
