Description
By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 68.6 | 68.6 |
| Mozilla | Firefox | unspecified – < 74, unspecified – < ESR68.6 | 74 |
| Mozilla | Firefox ESR | unspecified – < 68.6 | 68.6 |
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 | 68.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:68.6.0-1 | — |
| Debian 13 | firefox-esr | 68.6.0esr-1 | — |
| Debian 13 | thunderbird | 1:68.6.0-1 | — |
| Debian 12 | firefox-esr | 68.6.0esr-1 | — |
| Debian 12 | thunderbird | 1:68.6.0-1 | — |
| Debian 10 | firefox-esr | 68.6.0esr-1~deb10u1 | DSA-4639-1 |
| Debian 10 | thunderbird | 1:68.6.0-1~deb10u1 | DSA-4642-1 |
| Debian 9 | firefox-esr | 68.6.0esr-1~deb9u1 | DSA-4639-1 |
| Debian 9 | thunderbird | 1:68.6.0-1~deb9u1 | DSA-4642-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 68.6.0esr-1~deb8u1 | DLA-2140-1 |
| Debian 8 | thunderbird | 1:68.6.0-1~deb8u1 | DLA-2150-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 74.0+build3-0ubuntu1 | — |
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:68.6.0+build2-0ubuntu1 | — |
| Ubuntu 18.04 LTS | firefox | 74.0+build3-0ubuntu0.18.04.1 | USN-4299-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.18.04.1 | USN-4328-1 |
| Ubuntu 16.04 LTS | firefox | 74.0+build3-0ubuntu0.16.04.1 | USN-4299-1 |
| 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 +1 | 68.6.0-1.el8_1 | RHSA-2020:0919, RHSA-2020:0820 |
| RHEL 7 | firefox +1 | 68.6.0-1.el7_7 | RHSA-2020:0905, RHSA-2020:0815 |
| RHEL 6 | firefox +1 | 68.6.0-1.el6_10 | RHSA-2020:0914, RHSA-2020:0816 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | firefox +1 | 68.6.0-1.el8_0 | RHSA-2020:0918, RHSA-2020:0819 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.6.0-3.75.1 | SUSE-SU-2020:0686-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.6.0-3.74.1 | SUSE-SU-2020:0721-1 |
| SLES 12 SP5 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES 12 SP4 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES 12 SP3 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES 12 SP2 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES 11 SP4 | MozillaFirefox | 68.6.0-78.64.1 | SUSE-SU-2020:14312-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.6.0-109.110.1 | SUSE-SU-2020:0717-1 |
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 | 68.6.0-lp151.2.33.1 | openSUSE-SU-2020:0340-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.6.0-lp151.2.28.1 | openSUSE-SU-2020:0366-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 74.0-r0 | — |
| Alpine v3.23 | firefox +1 | 74.0-r0 | — |
| Alpine v3.23 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.22 | firefox +1 | 74.0-r0 | — |
| Alpine v3.22 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.21 | firefox +1 | 74.0-r0 | — |
| Alpine v3.21 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.20 | firefox | 74.0-r0 | — |
| Alpine v3.20 | firefox-esr +1 | 68.6.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 74.0-r0 | — |
| Alpine v3.19 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.18 | firefox | 74.0-r0 | — |
| Alpine v3.18 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.17 | firefox | 74.0-r0 | — |
| Alpine v3.17 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.16 | firefox | 74.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 68.6.0-r0 | — |
| Alpine v3.15 | firefox | 74.0-r0 | — |
| Alpine v3.15 | firefox-esr | 68.6.0-r0 | — |
| Alpine v3.14 | firefox | 74.0-r0 | — |
| Alpine v3.14 | firefox-esr | 68.6.0-r0 | — |
| Alpine v3.13 | firefox | 74.0-r0 | — |
| Alpine v3.13 | firefox-esr | 68.6.0-r0 | — |
| Alpine v3.12 | firefox | 74.0-r0 | — |
| Alpine v3.12 | mozjs68 +1 | 68.6.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.6.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 68.6.0-1.amzn2.0.1 | ALAS2-2020-1414 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox +1 | 68.6.0-1.0.1.el8_1 | ELSA-2020-0919, ELSA-2020-0820 |
| Oracle Linux 7 | firefox +1 | 68.6.0-1.0.1.el7_7 | ELSA-2020-0905, ELSA-2020-0815 |
Advisories 29
- RHSA-2020:0918 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0919 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0914 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0905 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0820 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0816 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0819 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2020:0815 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-4328-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4299-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4639-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4642-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2140-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2150-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:0721-1 Security update for MozillaThunderbird 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-2020:14312-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0340-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0686-1 Security update for MozillaFirefox 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-2020:0366-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2020:0717-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2020-1414 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 23, 2020
- ELSA-2020-0919 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 23, 2020
- ELSA-2020-0905 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 20, 2020
- ELSA-2020-0815 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 17, 2020
- ELSA-2020-0820 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 16, 2020
References
- https://www.mozilla.org/security/advisories/mfsa2020-08/
- https://www.mozilla.org/security/advisories/mfsa2020-10/
- https://www.mozilla.org/security/advisories/mfsa2020-09/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
- USN-4328-1 vendor-advisory
- USN-4335-1 vendor-advisory
- http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html