Description
A use-after-free vulnerability occurs when redirecting focus handling which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 52.1 | 52.1 |
| Mozilla | Firefox ESR | unspecified – < 45.9, unspecified – < 52.1 | 45.9 |
| Mozilla | Firefox | unspecified – < 53 | 53 |
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 | 45.9.0esr-1 | — |
| Debian 13 | firefox-esr | 45.9.0esr-1 | — |
| Debian 12 | firefox-esr | 45.9.0esr-1 | — |
| Debian 8 | firefox-esr | 45.9.0esr-1~deb8u1 | DSA-3831-1 |
| Debian 7 | firefox-esr | 45.9.0esr-1~deb7u1 | DLA-906-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 53.0+build6-0ubuntu0.16.04.1 | USN-3260-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.1.1+build1-0ubuntu0.16.04.1 | USN-3278-1 |
| Ubuntu 14.04 LTS | firefox | 53.0+build6-0ubuntu0.14.04.1 | USN-3260-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.1.1+build1-0ubuntu0.14.04.1 | USN-3278-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 52.1.0-2.el7_3 | RHSA-2017:1106 |
| RHEL 7 | thunderbird | 52.1.0-1.el7_3 | RHSA-2017:1201 |
| RHEL 6 | firefox | 52.1.0-2.el6_9 | RHSA-2017:1104 |
| RHEL 6 | thunderbird | 52.1.0-1.el6_9 | RHSA-2017:1201 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES 12 SP2 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP2 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES 12 SP1 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 SP1 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 12 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES 12 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES 12 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES 12 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES 11 SP4 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 52-24.3.44 | SUSE-SU-2017:2235-1 |
| SLES 11 SP4 | firefox-gcc5 +1 | 5.3.1+r233831-7.1 | SUSE-SU-2017:2235-1 |
| SLES 11 SP4 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES 11 SP4 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | MozillaFirefox-branding-SLED | 52-24.3.44 | SUSE-SU-2017:2235-1 |
| SLES 11 SP3 | firefox-gcc5 +1 | 5.3.1+r233831-7.1 | SUSE-SU-2017:2235-1 |
| SLES 11 SP3 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES 11 SP3 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES for SAP 12 SP2 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES for SAP 12 SP1 | java-1_8_0-openjdk | 1.8.0.121-23.4 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | MozillaFirefox | 45.9.0esr-105.1 | SUSE-SU-2017:1669-1, SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SLES for SAP 12 | mozilla-nspr | 4.13.1-18.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 12 | mozilla-nss | 3.29.5-57.1 | SUSE-SU-2017:1248-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SLES for SAP 11 SP4 | MozillaFirefox-branding-SLED | 52-24.3.44 | SUSE-SU-2017:2235-1 |
| SLES for SAP 11 SP4 | firefox-gcc5 +1 | 5.3.1+r233831-7.1 | SUSE-SU-2017:2235-1 |
| SLES for SAP 11 SP4 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SLES for SAP 11 SP4 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.1.0-30.1 | openSUSE-SU-2017:1268-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox | 52.2.0esr-108.3 | SUSE-SU-2017:1669-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox-branding-SLE | 52-31.1 | SUSE-SU-2017:1669-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE OpenStack Cloud 5 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE OpenStack Cloud 5 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager Proxy 2.1 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Manager 2.1 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.9.0esr-71.2 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox-branding-SLED | 52-24.3.44 | SUSE-SU-2017:2235-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | firefox-gcc5 +1 | 5.3.1+r233831-7.1 | SUSE-SU-2017:2235-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nspr | 4.13.1-32.1 | SUSE-SU-2017:1175-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nss | 3.29.5-46.1 | SUSE-SU-2017:2235-1, SUSE-SU-2017:1175-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| 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 | 52.1.0-2.0.1.el7_3 | ELSA-2017-1106 |
| Oracle Linux 7 | thunderbird | 52.1.0-1.0.1.el7_3 | ELSA-2017-1201 |
Advisories 17
- USN-3278-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-3260-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- RHSA-2017:1201 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2017:1104 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2017:1106 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- DLA-906-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3831-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2235-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLED, firefox-gcc5, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1175-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2017:1268-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1248-1 Security update for MozillaFirefox, mozilla-nss, mozilla-nspr, java-1_8_0-openjdk SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1669-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE 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-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2017-1201 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 8, 2017
- ELSA-2017-1106 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 20, 2017
References
- RHSA-2017:1106 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1349946
- https://www.mozilla.org/security/advisories/mfsa2017-11/
- https://www.mozilla.org/security/advisories/mfsa2017-10/
- 97940 vdb-entry
- DSA-3831 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2017-13/
- 1038320 vdb-entry
- RHSA-2017:1104 vendor-advisory
- RHSA-2017:1201 vendor-advisory