Description
Memory safety bugs were reported in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 52.3 | 52.3 |
| Mozilla | Firefox ESR | unspecified – < 52.3 | 52.3 |
| Mozilla | Firefox | unspecified – < 55 | 55 |
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 | 52.3.0esr-1 | — |
| Debian 13 | firefox-esr | 52.3.0esr-1 | — |
| Debian 12 | firefox-esr | 52.3.0esr-1 | — |
| Debian 9 | firefox-esr | 52.3.0esr-1~deb9u1 | DSA-3928-1 |
| Debian 9 | icedove | 1:52.3.0-4~deb9u1 | DSA-3968-1 |
| Debian 8 | firefox-esr | 52.3.0esr-1~deb8u2 | DSA-3928-1 |
| Debian 8 | icedove | 1:52.3.0-4~deb8u2 | DSA-3968-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | firefox-esr | 52.3.0esr-1~deb7u1 | DLA-1053-1 |
| Debian 7 | icedove | 1:52.3.0-4~deb7u1 | DLA-1087-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | mozjs38 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:52.4.0+build1-0ubuntu2 | — |
| Ubuntu 16.04 LTS | firefox | 55.0.1+build2-0ubuntu0.16.04.2 | USN-3391-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.3.0+build1-0ubuntu0.16.04.1 | USN-3416-1 |
| Ubuntu 14.04 LTS | firefox | 55.0.1+build2-0ubuntu0.14.04.2 | USN-3391-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.3.0+build1-0ubuntu0.14.04.1 | USN-3416-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 52.3.0-2.el7_4 | RHSA-2017:2456 |
| RHEL 7 | thunderbird | 52.3.0-1.el7_4 | RHSA-2017:2534 |
| RHEL 6 | firefox | 52.3.0-3.el6_9 | RHSA-2017:2456 |
| RHEL 6 | thunderbird | 52.3.0-1.el6_9 | RHSA-2017:2534 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES 12 SP2 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES 12 SP1 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES 12 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES 11 SP4 | MozillaFirefox | 52.3.0esr-72.9.1 | SUSE-SU-2017:2302-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 52-24.5.1 | SUSE-SU-2017:2302-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | MozillaFirefox | 52.3.0esr-72.9.1 | SUSE-SU-2017:2302-1 |
| SLES 11 SP3 | MozillaFirefox-branding-SLED | 52-24.5.1 | SUSE-SU-2017:2302-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 52.3.0esr-72.9.1 | SUSE-SU-2017:2302-1 |
| SLES for SAP 11 SP4 | MozillaFirefox-branding-SLED | 52-24.5.1 | SUSE-SU-2017:2302-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.3.0-42.1 | openSUSE-SU-2017:2209-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox | 52.3.0esr-109.3.1 | SUSE-SU-2017:2589-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 52.3.0esr-72.9.1 | SUSE-SU-2017:2302-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox-branding-SLED | 52-24.5.1 | SUSE-SU-2017:2302-1 |
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 | 52.3.0-3.0.1.el6_9 | ELSA-2017-2456 |
| Oracle Linux 7 | thunderbird | 52.3.0-1.0.1.el7_4 | ELSA-2017-2534 |
Advisories 17
- RHSA-2017:2534 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 24, 2026
- RHSA-2017:2456 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Aug 24, 2026
- USN-3416-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3391-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3968-1 icedove - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3928-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1053-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1087-1 icedove - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2302-1 Security update for MozillaFirefox 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
- SUSE-SU-2017:2589-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2017:2209-1 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
- WID-SEC-2025-1211 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2017-2534 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 24, 2017
- ELSA-2017-2456 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 11, 2017
References
- https://www.mozilla.org/security/advisories/mfsa2017-19/
- https://www.mozilla.org/security/advisories/mfsa2017-20/
- DSA-3968 vendor-advisory
- 100201 vdb-entry
- https://www.mozilla.org/security/advisories/mfsa2017-18/
- RHSA-2017:2456 vendor-advisory
- RHSA-2017:2534 vendor-advisory
- 1039124 vdb-entry
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1354443%2C1368576%2C1366903%2C1369913%2C1371424%2C1346590%2C1371890%2C1372985%2C1362924%2C1368105%2C1369994%2C1371283%2C1368362%2C1378826%2C1380426%2C1368030%2C1373220%2C1321384%2C1383002
- GLSA-201803-14 vendor-advisory
- DSA-3928 vendor-advisory