CVE-2020-26950
Firefox ESR and 2 others: In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting…
CVE-2020-26950 is fixed in 11 products on 2 platforms, first by firefox 82.0.3+build1-0ubuntu0.18.04.1, released November 9, 2020. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
8.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.4233
98th percentile
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Mozilla Thunderbird (en-US) | 78.10.0 | Mozilla Thunderbird (en-US) 78.10.0 | Apr 15, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:78.4.1-1.el8_3 | RHSA-2020:5100 | Nov 12, 2020 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 82.0.3+build1-0ubuntu0.18.04.1 | firefox 82.0.3+build1-0ubuntu0.18.04.1 | Nov 9, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 82.0.3+build1-0ubuntu0.20.04.1 | firefox 82.0.3+build1-0ubuntu0.20.04.1 | Nov 9, 2020 |
| firefox · ol 8 | 0:78.4.1-1.0.1.el8_3 | ELSA-2020-5100 | Nov 17, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 82.0.3+build1-0ubuntu0.18.04.1 | firefox-geckodriver 82.0.3+build1-0ubuntu0.18.04.1 | Nov 9, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 82.0.3+build1-0ubuntu0.20.04.1 | firefox-geckodriver 82.0.3+build1-0ubuntu0.20.04.1 | Nov 9, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 82.0.3+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 82.0.3+build1-0ubuntu0.18.04.1 | Nov 9, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 82.0.3+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 82.0.3+build1-0ubuntu0.20.04.1 | Nov 9, 2020 |
| thunderbird · RHEL 8 | 0:78.4.3-1.el8_3 | RHSA-2020:5146 | Nov 18, 2020 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| thunderbird · ol 8 | 0:78.4.3-1.0.1.el8_3 | ELSA-2020-5146 | Nov 19, 2020 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird-gnome-support 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | thunderbird-mozsymbols 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-calendar-timezones 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-gdata-provider 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:78.8.1+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:78.8.1+build1-0ubuntu0.18.04.1 | Apr 22, 2021 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:78.7.1+build1-0ubuntu0.20.04.1 | xul-ext-lightning 1:78.7.1+build1-0ubuntu0.20.04.1 | Jan 25, 2021 |
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