Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 45.3.0esr-1 | — |
| Debian 13 | firefox-esr | 45.3.0esr-1 | — |
| Debian 12 | firefox-esr | 45.3.0esr-1 | — |
| Debian 8 | firefox-esr | 45.3.0esr-1~deb8u1 | DSA-3640-1 |
| Debian 7 | firefox-esr | 45.3.0esr-1~deb7u1 | DLA-585-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 48.0+build2-0ubuntu0.16.04.1 | USN-3044-1 |
| Ubuntu 14.04 LTS | firefox | 48.0+build2-0ubuntu0.14.04.1 | USN-3044-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 45.3.0-1.el7_2 | RHSA-2016:1551 |
| RHEL 6 | firefox | 45.3.0-1.el6_8 | RHSA-2016:1551 |
| RHEL 5 | firefox | 45.3.0-1.el5_11 | RHSA-2016:1551 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP4 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP3 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP2 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP1 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2019:2872-1, SUSE-SU-2016:2131-1 |
Show 21 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES 11 SP4 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SLES 11 SP3 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SLES 11 SP2 | MozillaFirefox | 45.3.0esr-48.1 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | MozillaFirefox-branding-SLED | 45.0-20.38 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | firefox-fontconfig | 2.11.0-4.2 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | mozilla-nspr | 4.12-25.2 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | mozilla-nss | 3.21.1-26.2 | SUSE-SU-2016:2061-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2019:2872-1, SUSE-SU-2016:2131-1 |
| SLES for SAP 12 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 45.3.0-9.1 | openSUSE-SU-2016:2254-1, openSUSE-SU-2016:2253-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 45.3.0-1.0.1.el7_2 | ELSA-2016-1551 |
Advisories 14
- RHSA-2016:1551 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3044-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-585-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3640-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2061-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLED, mozilla-nspr and mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2016:2254-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2872-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2131-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2195-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2016:2253-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2016-1551 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 3, 2016
References
- DSA-3640 vendor-advisory
- 1036508 vdb-entry
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- USN-3044-1 vendor-advisory
- RHSA-2016:1551 vendor-advisory
- GLSA-201701-15 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1255270
- openSUSE-SU-2016:1964 vendor-advisory
- 92261 vdb-entry
- http://www.mozilla.org/security/announce/2016/mfsa2016-63.html
- openSUSE-SU-2016:2026 vendor-advisory