During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Dec 1, 2017 | Oct 25, 2017 |
| Amazon_linux | — | Upgrade nss | Oct 13, 2017 | Sep 28, 2017 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 11, 2018 |
| Centos_linux | — | Upgrade nss-pkcs11-develUpgrade nss-debuginfoUpgrade nss-sysinitUpgrade nss-toolsUpgrade nss-develUpgrade nss | Oct 2, 2017 | Sep 28, 2017 |
| Debian | — | Upgrade firefox-esrUpgrade nssUpgrade thunderbird | Sep 30, 2017 | Sep 28, 2017 |
| Freebsd | — | Upgrade nssUpgrade linux-c7-nssUpgrade linux-firefoxUpgrade linux-thunderbirdUpgrade libxulUpgrade linux-c6-nssUpgrade firefoxUpgrade thunderbirdUpgrade linux-seamonkeyUpgrade seamonkeyUpgrade firefox-esr | Oct 12, 2017 | Oct 12, 2017 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin. | Feb 20, 2018 | Feb 20, 2018 |
| Huawei Euleros 2_0_sp1 | — | Upgrade nss-sysinitUpgrade nssUpgrade nss-develUpgrade nss-tools | Nov 30, 2017 | Sep 28, 2017 |
| Huawei Euleros 2_0_sp2 | — | Upgrade nss-develUpgrade nssUpgrade nss-toolsUpgrade nss-sysinit | Nov 30, 2017 | Sep 28, 2017 |
| Mfsa2017 21 | — | Upgrade to Mozilla Firefox version 56.0Upgrade to the latest version of Mozilla Firefox | Jul 12, 2018 | Jun 11, 2018 |
| Mfsa2017 22 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 52.4 | Sep 29, 2017 | Sep 28, 2017 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 52.4 | Oct 11, 2017 | Oct 9, 2017 |
| Oracle Solaris | — | Upgrade SUNWtlsu to version 4.36.1-11.4.7.0.1.2.0 on Solaris 11.4Upgrade web/browser/firefox/plugin/firefox-java to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade SUNWprd to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade web/browser/firefox to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade system/mozilla-nss to version 4.36.1-11.4.7.0.1.2.0 on Solaris 11.4Upgrade SUNWpr to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade system/library/mozilla-nss/header-nss to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade SUNWtlsd to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade SUNWtls to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3Upgrade SUNWjss to version 4.3.2-11.4.7.0.1.2.0 on Solaris 11.4Upgrade system/library/mozilla-nss to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade consolidation/sic_team/sic_team-incorporation to version 0.11.5-11.4.7.0.1.2.0 on Solaris 11.4Upgrade library/java/jss to version 4.3.2-11.4.7.0.1.2.0 on Solaris 11.4Upgrade library/java/commons-logging to version 1.0.4-11.4.7.0.1.2.0 on Solaris 11.4Upgrade SUNWaclg to version 1.0.4-11.4.7.0.1.2.0 on Solaris 11.4Upgrade library/security/nss to version 4.38-11.4.7.0.1.2.0 on Solaris 11.4Upgrade security/nss-utilities to version 4.36.1-11.4.7.0.1.2.0 on Solaris 11.4Upgrade library/nspr/header-nspr to version 0.5.11-11.4.7.0.1.2.0 on Solaris 11.4Upgrade mail/thunderbird to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3Upgrade web/data/firefox-bookmarks to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade library/java/apache-commons-logging to version 1.0.4-11.4.7.0.1.2.0 on Solaris 11.4 | Nov 30, 2017 | Nov 30, 2017 |
| Oracle_linux | — | Upgrade nssUpgrade nss-pkcs11-develUpgrade nss-develUpgrade nss-toolsUpgrade nss-sysinit | Sep 29, 2017 | Sep 28, 2017 |
| Redhat_linux | — | Upgrade nssUpgrade nss-debuginfoNo solution existsUpgrade nss-toolsUpgrade nss-sysinitUpgrade nss-pkcs11-develUpgrade nss-devel | Oct 4, 2017 | Sep 28, 2017 |
| Suse | — | Upgrade libfreebl3Upgrade mozilla-nss-sysinitUpgrade libfreebl3-hmacUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbirdUpgrade mozilla-nssUpgrade libsoftokn3-hmac-32bitUpgrade libsoftokn3-32bitUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-commonUpgrade mozilla-nss-sysinit-32bitUpgrade MozillaFirefox-develUpgrade libsoftokn3Upgrade MozillaFirefox-translationsUpgrade MozillaThunderbird-develUpgrade mozilla-nss-32bitUpgrade MozillaThunderbird-buildsymbolsUpgrade mozilla-nss-certs-32bitUpgrade mozilla-nss-toolsUpgrade libfreebl3-x86Upgrade libsoftokn3-x86Upgrade mozilla-nss-certsUpgrade libsoftokn3-hmacUpgrade MozillaFirefoxUpgrade mozilla-nss-develUpgrade libfreebl3-32bitUpgrade libfreebl3-hmac-32bitUpgrade mozilla-nss-x86 | Oct 2, 2017 | Sep 28, 2017 |
| Ubuntu | — | Upgrade libnss3Upgrade thunderbirdUpgrade firefox | Oct 2, 2017 | Sep 28, 2017 |
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