VULNERABILITY INTELLIGENCE
CVE-2015-2721
CVSS score4.3 MEDIUM
EPSS probability2.83%
CISA KEVNot currently listed
Published2015-07-06
Last modified2026-06-17
CVSS vectorAV:N/AC:M/Au:N/C:N/I:P/A:N
Description
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.
Primary references
- security@mozilla.org
- security@mozilla.org
- security@mozilla.org — Third Party Advisory
- security@mozilla.org — Third Party Advisory
- security@mozilla.org
- security@mozilla.org
- security@mozilla.org
- security@mozilla.org — Third Party Advisory
- security@mozilla.org — Third Party Advisory
- security@mozilla.org — Vendor Advisory
- security@mozilla.org — Third Party Advisory
- security@mozilla.org — Third Party Advisory