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CVE-2015-2721 PUBLISHED

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

EPSS 0.61% · 69.5th percentile

Risk Scores

EPSS Score
0.61%
69.5th percentile

Affected Products

VendorProductVersions
Ubuntu:14.04:LTSfirefox0, 24.0+build1-0ubuntu1, 25.0+build3-0ubuntu0.13.10.1
Ubuntu:14.04:LTSnss0, 2:3.15.1-1ubuntu1, 2:3.15.2-1
Ubuntu:14.04:LTSthunderbird0, 1:24.0+build1-0ubuntu1, 1:24.0+build1-0ubuntu2

Timeline

References

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