Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2015-2721

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.009
EPSS Ranking 74.8%
CVSS Severity
CVSS v2 Score 4.3
References
Products affected by CVE-2015-2721


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