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Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 preserve the network connection used for favicon resource retrieval after the associated browser window is closed, which makes it easier for remote web servers to track users by observing network traffic from multiple IP addresses.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Centos_linux | — | Upgrade firefox | Aug 6, 2016 | Aug 3, 2016 |
| Debian | — | Upgrade firefox-esr | Aug 6, 2016 | Aug 3, 2016 |
| Freebsd | — | Upgrade linux-thunderbirdUpgrade libxulUpgrade linux-firefoxUpgrade linux-seamonkeyUpgrade firefoxUpgrade thunderbirdUpgrade firefox-esrUpgrade seamonkey | Dec 10, 2025 | Sep 7, 2016 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox.Upgrade www-client/firefox-bin. | Oct 30, 2017 | Aug 4, 2016 |
| Mfsa2016 63 | — | Upgrade to Mozilla Firefox ESR version 45.3Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 48.0 | Aug 3, 2016 | Aug 2, 2016 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 45.4.0-0.175.3.14.0.4.0 on Solaris 11.3Upgrade developer/yasm to version 1.3.0-0.175.3.14.0.2.0 on Solaris 11.3Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 45.3.0-0.175.3.14.0.4.0 on Solaris 11.3Upgrade mail/thunderbird to version 45.3.0-0.175.3.14.0.4.0 on Solaris 11.3Upgrade web/browser/firefox to version 45.4.0-0.175.3.14.0.4.0 on Solaris 11.3 | May 29, 2017 | Aug 4, 2016 |
| Oracle_linux | — | Upgrade firefox | Aug 6, 2016 | Aug 2, 2016 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade firefox | Aug 3, 2016 | Aug 3, 2016 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-buildsymbolsUpgrade mozilla-nssUpgrade mozilla-nspr-develUpgrade mozilla-nsprUpgrade libfreebl3Upgrade mozilla-nspr-32bitUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-branding-SLEDUpgrade MozillaThunderbird-develUpgrade firefox-fontconfigUpgrade mozilla-nss-toolsUpgrade MozillaThunderbird-translations-commonUpgrade libfreebl3-32bitUpgrade MozillaFirefox-translationsUpgrade mozilla-nss-32bitUpgrade mozilla-nss-develUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox | Aug 26, 2016 | Aug 4, 2016 |
| Ubuntu | — | Upgrade firefox | Aug 6, 2016 | Aug 4, 2016 |
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