CVE-2010-3765 Mozilla Multiple Products: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline Oct 27, 2025
What to do
- Install Mozilla's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
- Keep extensions to a minimum and remove ones you do not recognise.
- Stop using Internet Explorer and any browser that no longer gets updates.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: A malicious or hacked website can be enough. Browser bugs are often the first step in a longer attack on the whole computer or phone.
The details
- Official name
- Mozilla Multiple Products Remote Code Execution Vulnerability
- Product
- Mozilla Multiple Products
- CISA description
- Mozilla Firefox, SeaMonkey, and Thunderbird contain an unspecified vulnerability when JavaScript is enabled. This allows remote attackers to execute arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption.
- Type of flaw
- Command or code injection
- Confirmed exploited
- Oct 6, 2025
- US federal patch deadline
- Oct 27, 2025
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Answering about CVE-2010-3765 ·
Questions about CVE-2010-3765
Is CVE-2010-3765 being exploited?
Yes. CISA added CVE-2010-3765 to its Known Exploited Vulnerabilities catalog on Oct 6, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2010-3765?
Install Mozilla's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships. Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
Am I affected by CVE-2010-3765?
Only if you use Mozilla Multiple Products. This one is aimed at devices or apps of the kind people own.