CVE-2011-0065: Mozilla Firefox and SeaMonkey use-after-free in OBJECT mChannel

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 18 September 2026. Confidence: medium.

high priorityCVSS 2.0 score of 10 indicates maximum severity, and the high EPSS percentile suggests likely exploitation, but the lack of KEV listing and specific exploit details keeps it from critical.

What it is

A use-after-free flaw exists in Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, and SeaMonkey before 2.0.14, related to OBJECT's mChannel. A remote attacker can trigger the freed memory condition and potentially execute arbitrary code in the context of the browser. The record does not include a detailed technical description beyond the mChannel reference.

Impact

Successful exploitation can lead to arbitrary code execution with the privileges of the affected browser process. This could allow an attacker to install malware, steal data, or take control of the user's system.

Attack surface

The vulnerability is reachable remotely over the network with no authentication required, per the CVSS vector AV:N/AC:L/Au:N. User interaction is not explicitly stated in the record, but typical browser exploitation requires the victim to visit a malicious page or interact with crafted content.

Exploitation

The CVE is not listed in CISA KEV, and no reference tags indicate public exploit code or active exploitation. EPSS probability is 0.73835 (99.45th percentile), suggesting a high likelihood of exploitation activity in the wild, but this is a statistical estimate only.

What to do

• Upgrade to Firefox 3.5.19 or later, Firefox 3.6.17 or later, or SeaMonkey 2.0.14 or later as applicable.
• Apply vendor patches or distribution updates (e.g., Debian DSA-2227, DSA-2228, DSA-2235, Mandriva MDVSA-2011:079) for affected packages.
• If immediate patching is not possible, consider disabling or restricting JavaScript and plugin content in the browser, though this may not fully mitigate the flaw.
• Monitor vendor advisories (MFSA 2011-13) for any updated guidance or workarounds.

Detection

• Monitor for crashes or abnormal termination of Firefox or SeaMonkey processes, which may indicate attempted exploitation of use-after-free conditions.
• Use endpoint detection to look for suspicious child processes spawned by browser processes, a common post-exploitation behavior.
• Review network logs for known malicious domains or exploit kit traffic, though no specific indicators are provided in the record.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.