CVE-2011-3866

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-09-29 · updated 2026-06-16
Weakness: CWE-264

Description

Mozilla Firefox before 7.0 and SeaMonkey before 2.4 do not properly restrict availability of motion data events, which makes it easier for remote attackers to read keystrokes by leveraging JavaScript code running in a background tab.

Affected products

Mozilla Firefox: through 7.0
Mozilla Seamonkey: before 2.4 — fixed in 2.4

How to fix

Upgrade to a fixed version: Mozilla Seamonkey 2.4. Check the vendor advisory for mitigations.

References

http://www.mozilla.org/security/announce/2011/mfsa2011-45.html
http://www.usenix.org/events/hotsec11/tech/tech.html#Cai
https://bugzilla.mozilla.org/show_bug.cgi?id=682562
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13954
http://www.mozilla.org/security/announce/2011/mfsa2011-45.html
http://www.usenix.org/events/hotsec11/tech/tech.html#Cai
https://bugzilla.mozilla.org/show_bug.cgi?id=682562
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13954

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