CVE-2015-4495 Mozilla Firefox: information leak

In plain words: The program reveals information it should keep private. Leaked secrets — tokens, passwords or memory contents — that help a bigger attack.

Confirmed exploited by CISA on May 25, 2022 · US federal patch deadline Jun 15, 2022

What to do

Install Mozilla's security update for Firefox. 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 Firefox Security Feature Bypass Vulnerability
Product: Mozilla Firefox
CISA description: Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges.
Type of flaw: Information leak (CWE-200)
Confirmed exploited: May 25, 2022
US federal patch deadline: Jun 15, 2022

NVD record ↗CISA catalog ↗

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Questions about CVE-2015-4495

Is CVE-2015-4495 being exploited?

Yes. CISA added CVE-2015-4495 to its Known Exploited Vulnerabilities catalog on May 25, 2022, which means there is reliable evidence of real-world attacks.

How do I fix CVE-2015-4495?

Install Mozilla's security update for Firefox. 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-2015-4495?

Only if you use Mozilla Firefox. This one is aimed at devices or apps of the kind people own.