CVE-2010-4508

Severity: critical (CVSS 10.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-12-09 · updated 2026-06-16

Description

The WebSockets implementation in Mozilla Firefox 4 through 4.0 Beta 7 does not properly perform proxy upgrade negotiation, which has unspecified impact and remote attack vectors, related to an "inherent problem" with the WebSocket specification.

Affected products

Mozilla Firefox: 4.0-beta1, 4.0-beta2, 4.0-beta3, 4.0-beta4, 4.0-beta5, 4.0-beta6

References

http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
http://osvdb.org/69758
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12251
https://wiki.mozilla.org/Platform/2010-12-07
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
http://osvdb.org/69758
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12251
https://wiki.mozilla.org/Platform/2010-12-07

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