Description
An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | before 70 | — |
| Mozilla | Thunderbird | before 68.2 | — |
| Mozilla | Firefox ESR | before 68.2 | — |
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 | 68.2.0esr-1 | — |
| Debian 14 | thunderbird | 1:68.2.1-1 | — |
| Debian 13 | firefox-esr | 68.2.0esr-1 | — |
| Debian 13 | thunderbird | 1:68.2.1-1 | — |
| Debian 12 | firefox-esr | 68.2.0esr-1 | — |
| Debian 12 | thunderbird | 1:68.2.1-1 | — |
| Debian 10 | firefox-esr | 68.2.0esr-1~deb10u1 | DSA-4549-1 |
| Debian 10 | thunderbird | 1:68.2.2-1~deb10u1 | DSA-4571-1 |
| Debian 9 | firefox-esr | 68.2.0esr-1~deb9u2 | DSA-4549-1 |
| Debian 9 | thunderbird | 1:68.2.2-1~deb9u1 | DSA-4571-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 68.2.0esr-1~deb8u1 | DLA-1987-1 |
| Debian 8 | thunderbird | 1:68.2.2-1~deb8u1 | DLA-1997-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 70.0+build2-0ubuntu1 | — |
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 70.0+build2-0ubuntu0.18.04.1 | USN-4165-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:68.2.1+build1-0ubuntu0.18.04.1 | USN-4202-1 |
| Ubuntu 16.04 LTS | firefox | 70.0+build2-0ubuntu0.16.04.1 | USN-4165-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | USN-4335-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 68.2.0-2.el8_0 | RHSA-2019:3196 |
| RHEL 8 | thunderbird | 68.2.0-1.el8_0 | RHSA-2019:3237 |
| RHEL 7 | firefox +1 | 68.2.0-1.el7_7 | RHSA-2019:3210, RHSA-2019:3193 |
| RHEL 6 | firefox | 68.2.0-4.el6_10 | RHSA-2019:3281 |
| RHEL 6 | thunderbird | 68.2.0-2.el6_10 | RHSA-2019:3756 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.2.0-3.59.1 | SUSE-SU-2019:2871-1 |
| SLES 15 SP1 | MozillaFirefox-branding-SLE | 68-4.11.2 | SUSE-SU-2019:2871-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.2.1-3.58.1 | SUSE-SU-2019:2912-1 |
| SLES 15 | MozillaFirefox | 68.2.0-3.59.1 | SUSE-SU-2019:2871-1 |
| SLES 15 | MozillaFirefox-branding-SLE | 68-4.11.2 | SUSE-SU-2019:2871-1 |
| SLES 15 | MozillaThunderbird | 68.2.1-3.58.1 | SUSE-SU-2019:2912-1 |
| 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 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP1 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 11 SP4 | MozillaFirefox | 68.2.0-78.51.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 68-21.9.8 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-atk | 2.26.1-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-cairo | 1.15.10-2.13.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gdk-pixbuf | 2.36.11-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-glib2 | 2.54.3-2.14.7 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gtk3 | 3.10.9-2.15.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-harfbuzz | 1.7.5-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi | 3.2.1.git259-2.3.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi-gcc5 | 5.3.1+r233831-14.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-pango | 1.40.14-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nspr | 4.21-29.6.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nss | 3.45-38.9.3 | SUSE-SU-2019:14246-1 |
| 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 | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| 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 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 | 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 |
| openSUSE Leap 15.1 | MozillaFirefox | 68.2.0-lp151.2.18.2 | openSUSE-SU-2019:2451-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.2.1-lp151.2.16.1 | openSUSE-SU-2019:2452-1 |
| openSUSE Leap 15.1 | firefox-esr-branding-openSUSE +1 | 68-lp151.3.3.1 | openSUSE-SU-2019:2451-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 68.2.0-lp150.3.71.1 | openSUSE-SU-2019:2459-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 68.2.1-lp150.3.54.1 | openSUSE-SU-2019:2464-1 |
| openSUSE Leap 15.0 | firefox-esr-branding-openSUSE +1 | 68-lp150.3.3.1 | openSUSE-SU-2019:2459-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 70.0-r0 | — |
| Alpine v3.23 | firefox +1 | 70.0-r0 | — |
| Alpine v3.23 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.22 | firefox +1 | 70.0-r0 | — |
| Alpine v3.22 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.21 | firefox +1 | 70.0-r0 | — |
| Alpine v3.21 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.20 | firefox | 70.0-r0 | — |
| Alpine v3.20 | firefox-esr | 68.2.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 70.0-r0 | — |
| Alpine v3.19 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.18 | firefox | 70.0-r0 | — |
| Alpine v3.18 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.17 | firefox | 70.0-r0 | — |
| Alpine v3.17 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.16 | firefox | 70.0-r0 | — |
| Alpine v3.16 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.15 | firefox | 70.0-r0 | — |
| Alpine v3.15 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.14 | firefox | 70.0-r0 | — |
| Alpine v3.14 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.13 | firefox | 70.0-r0 | — |
| Alpine v3.13 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.12 | firefox | 70.0-r0 | — |
| Alpine v3.12 | firefox-esr | 68.2.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.2.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 68.2.0-1.amzn2.0.1 | ALAS2-2019-1376 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 68.2.0-2.0.1.el8_0 | ELSA-2019-3196 |
| Oracle Linux 8 | thunderbird | 68.2.0-1.0.1.el8_0 | ELSA-2019-3237 |
| Oracle Linux 7 | firefox +1 | 68.2.0-1.0.1.el7_7 | ELSA-2019-3210, ELSA-2019-3193 |
Advisories 29
- RHSA-2019:3756 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3210 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3237 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3196 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3193 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2019:3281 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4202-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4165-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4549-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4571-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1987-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1997-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:2912-1 Recommended update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2464-1 Recommended update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2451-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2452-1 Recommended 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
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2459-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14246-1 Security update for Mozilla Firefox 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
- SUSE-SU-2019:2871-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLE SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2019-1376 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 18, 2019
- ELSA-2019-3237 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 30, 2019
- ELSA-2019-3210 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 29, 2019
- ELSA-2019-3196 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 24, 2019
- ELSA-2019-3193 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 23, 2019