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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade nss | Aug 30, 2017 | Jul 5, 2015 |
| Centos_linux | — | Upgrade nss-pkcs11-develUpgrade nss-util-develUpgrade nss-sysinitUpgrade nss-utilUpgrade nss-toolsUpgrade nss-develUpgrade nss | Dec 1, 2016 | Jul 5, 2015 |
| Debian | — | Upgrade icedoveUpgrade nssUpgrade iceweasel | Jul 30, 2024 | Jul 6, 2015 |
| Freebsd | — | Upgrade linux-firefoxUpgrade libxulUpgrade seamonkeyUpgrade firefoxUpgrade thunderbirdUpgrade linux-seamonkeyUpgrade firefox-esrUpgrade linux-thunderbird | Dec 10, 2025 | Jul 16, 2015 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird-bin.Upgrade mail-client/thunderbird.Upgrade www-client/firefox.Upgrade dev-libs/nss.Upgrade dev-libs/nspr.Upgrade www-client/firefox-bin. | Oct 30, 2017 | Jul 5, 2015 |
| Mfsa2015 71 | — | Upgrade to Mozilla Firefox ESR version 31.8Upgrade to Mozilla Firefox version 39.0Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 38.1 | Jul 8, 2015 | Jul 5, 2015 |
| Mozilla Seamonkey | — | Upgrade to Mozilla SeaMonkey version 2.35Upgrade to the latest version of Mozilla SeaMonkey | Oct 22, 2015 | Jul 5, 2015 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 38.1Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 31.8 | Sep 14, 2015 | Jul 5, 2015 |
| Oracle Solaris | — | Upgrade entire to version 0.5.11-0.175.3.0.0.30.0 on Solaris 11.3Upgrade consolidation/desktop/desktop-incorporation to version 0.5.11-0.175.3.0.0.28.0 on Solaris 11.3Upgrade web/browser/firefox to version 38.4.0-0.175.3.8.0.2.0 on Solaris 11.3Upgrade database/sqlite-3 to version 3.9.2-0.175.3.8.0.2.0 on Solaris 11.3Upgrade database/sqlite-3/documentation to version 3.9.2-0.175.3.8.0.2.0 on Solaris 11.3Upgrade runtime/tcl-8/tcl-sqlite-3 to version 3.9.2-0.175.3.8.0.2.0 on Solaris 11.3 | May 29, 2017 | Jul 5, 2015 |
| Oracle_linux | — | Upgrade nssUpgrade nss-toolsUpgrade nss-develUpgrade nss-pkcs11-devel | Oct 16, 2024 | Jul 6, 2015 |
| Suse | — | Upgrade libfreebl3-debuginfoUpgrade MozillaFirefox-translations-commonUpgrade mozilla-nspr-develUpgrade mozilla-nss-x86Upgrade MozillaFirefoxUpgrade mozilla-nss-sysinit-x86Upgrade mozilla-nss-certs-debuginfoUpgrade libsoftokn3-32bitUpgrade mozilla-nss-certs-debuginfo-32bitUpgrade MozillaThunderbird-debugsourceUpgrade mozilla-nss-toolsUpgrade mozilla-nss-sysinit-debuginfo-x86Upgrade libfreebl3-32bitUpgrade firefox-gcc47Upgrade mozilla-nss-debugsourceUpgrade mozilla-nss-tools-debuginfoUpgrade mozilla-nss-debuginfoUpgrade mozilla-nss-certs-x86Upgrade libsoftokn3-debuginfo-x86Upgrade MozillaThunderbird-develUpgrade mozilla-nss-certs-debuginfo-x86Upgrade libfreebl3-debuginfo-x86Upgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade firefox-libstdc++6Upgrade libsoftokn3Upgrade mozilla-nss-32bitUpgrade mozilla-nspr-x86Upgrade libsoftokn3-hmac-32bitUpgrade mozilla-nss-sysinit-debuginfoUpgrade libsoftokn3-hmacUpgrade mozilla-nss-develUpgrade libfreebl3-hmac-32bitUpgrade MozillaThunderbird-translations-commonUpgrade mozilla-nss-debuginfo-x86Upgrade mozilla-nspr-debugsourceUpgrade mozilla-nspr-debuginfo-x86Upgrade libsoftokn3-debuginfo-32bitUpgrade firefox-libgcc_s1Upgrade MozillaFirefox-branding-SLEDUpgrade MozillaFirefox-debuginfoUpgrade MozillaThunderbirdUpgrade mozilla-nsprUpgrade mozilla-nss-sysinit-debuginfo-32bitUpgrade MozillaFirefox-translationsUpgrade mozilla-nss-certs-32bitUpgrade libfreebl3-x86Upgrade libfreebl3Upgrade mozilla-nssUpgrade MozillaFirefox-develUpgrade mozilla-nss-debuginfo-32bitUpgrade mozilla-nss-sysinitUpgrade mozilla-nspr-debuginfo-32bitUpgrade mozilla-nspr-debuginfoUpgrade libsoftokn3-x86Upgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-debuginfoUpgrade MozillaFirefox-debugsourceUpgrade MozillaThunderbird-buildsymbolsUpgrade mozilla-nss-certsUpgrade mozilla-nspr-32bitUpgrade libfreebl3-debuginfo-32bitUpgrade mozilla-nss-sysinit-32bitUpgrade libfreebl3-hmacUpgrade mozillafirefox-buildsymbolsUpgrade libsoftokn3-debuginfo | May 11, 2016 | Jul 5, 2015 |
| Ubuntu | — | Upgrade thunderbirdUpgrade libnss3Upgrade firefox | Nov 8, 2024 | Jul 6, 2015 |
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