CVE-2021-43539
Mozilla Firefox ESR and 3 others: Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC…
CVE-2021-43539 is fixed in 12 products on 2 platforms, first by Mozilla Thunderbird (en-US) 91.4.0, released December 3, 2021. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
9.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0173
77th percentile
Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC occurring within the call not tracing those live pointers. This could have led to a use-after-free causing a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 102.0 | Mozilla Firefox ESR (en-US) 102.0 | Jun 23, 2022 |
| Mozilla Thunderbird (en-US) | 91.4.0 | Mozilla Thunderbird (en-US) 91.4.0 | Dec 3, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:91.4.0-1.el8_5 | RHSA-2021:5013 | Dec 8, 2021 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox 95.0+build1-0ubuntu1 | Dec 7, 2021 |
| firefox · almalinux 8 | 91.4.0-1.el8_5.alma | ALSA-2021:5013 | Dec 8, 2021 |
| firefox · ol 8 | 0:91.4.0-1.0.1.el8_5 | ELSA-2021-5013 | Dec 9, 2021 |
| firefox · rocky 8 | 0:91.4.0-1.el8_5 | RLSA-2021:5013 | Dec 8, 2021 |
| firefox-esr · Debian 12.15 (bookworm) | 91.4.0esr-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| firefox-esr · Debian 13.5 (trixie) | 91.4.0esr-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| firefox-esr · Debian 14 | 91.4.0esr-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox-geckodriver 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox-geckodriver 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox-geckodriver · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox-geckodriver 95.0+build1-0ubuntu1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 95.0+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 95.0+build1-0ubuntu0.18.04.1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 95.0+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 95.0+build1-0ubuntu0.20.04.1 | Dec 7, 2021 |
| firefox-mozsymbols · Ubuntu 22.04.1 LTS (jammy) | 95.0+build1-0ubuntu1 | firefox-mozsymbols 95.0+build1-0ubuntu1 | Dec 7, 2021 |
| thunderbird · Debian 12.15 (bookworm) | 1:91.4.0-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| thunderbird · Debian 13.5 (trixie) | 1:91.4.0-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| thunderbird · Debian 14 | 1:91.4.0-1 | DEBIAN-CVE-2021-43539 | Dec 8, 2021 |
| thunderbird · RHEL 8 | 0:91.4.0-2.el8_5 | RHSA-2021:5045 | Dec 9, 2021 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| thunderbird · almalinux 8 | 91.4.0-2.el8_5.alma | ALSA-2021:5045 | Dec 9, 2021 |
| thunderbird · ol 8 | 0:91.4.0-2.0.1.el8_5 | ELSA-2021-5045 | Dec 10, 2021 |
| thunderbird · rocky 8 | 0:91.4.0-2.el8_5 | RLSA-2021:5045 | Dec 9, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird-gnome-support 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird-mozsymbols 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-calendar-timezones 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-gdata-provider 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-lightning 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
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