# CVE-2020-16042: firefox: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This... CVE-2020-16042 is fixed in 14 products on 1 platform, first by firefox 84.0+build3-0ubuntu0.18.04.1, released December 14, 2020. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2020-16042 - Priority: Routine - CVSS: 6.5 (Important) - EPSS: 0.0111 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Dec 14, 2020 ## Description Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 78.6.0 ESR. Security Fix(es): * chromium-browser: Uninitialized Use in V8 (CVE-2020-16042) * Mozilla: Heap buffer overflow in WebGL (CVE-2020-26971) * Mozilla: CSS Sanitizer performed incorrect sanitization (CVE-2020-26973) * Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free (CVE-2020-26974) * Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6 (CVE-2020-35113) * Mozilla: Internal network hosts could have been probed by a malicious webpage (CVE-2020-26978) * Mozilla: The proxy.onRequest API did not catch view-source URLs (CVE-2020-35111) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | chromium-browser Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-browser 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 | | Linux | chromium-browser-l10n Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-browser-l10n 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-l10n-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 | | Linux | chromium-chromedriver Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-chromedriver 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-chromedriver-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 | | Linux | chromium-codecs-ffmpeg Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 | | Linux | chromium-codecs-ffmpeg-extra Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg-extra 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-extra-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 | | Linux | firefox RHEL 8 | 0:78.6.0-1.el8_3 | [RHSA-2020:5562](https://patchblox.com/security/data/fix/linux/rhsa-2020-5562.md) | Dec 16, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 84.0+build3-0ubuntu0.18.04.1 | [firefox 84.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-84.0-build3-0ubuntu0.18.04.1.md) | Dec 14, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | [firefox 84.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-84.0-build3-0ubuntu0.20.04.1.md) | Dec 14, 2020 | | Linux | firefox ol 8 | 0:78.6.0-1.0.1.el8_3 | [ELSA-2020-5562-1](https://patchblox.com/security/data/fix/linux/elsa-2020-5562-1.md) | Dec 17, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 84.0+build3-0ubuntu0.18.04.1 | [firefox-geckodriver 84.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-84.0-build3-0ubuntu0.18.04.1.md) | Dec 14, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | [firefox-geckodriver 84.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-84.0-build3-0ubuntu0.20.04.1.md) | Dec 14, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 84.0+build3-0ubuntu0.18.04.1 | [firefox-mozsymbols 84.0+build3-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-84.0-build3-0ubuntu0.18.04.1.md) | Dec 14, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | [firefox-mozsymbols 84.0+build3-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-84.0-build3-0ubuntu0.20.04.1.md) | Dec 14, 2020 | | Linux | thunderbird RHEL 8 | 0:78.6.0-1.el8_3 | [RHSA-2020:5624](https://patchblox.com/security/data/fix/linux/rhsa-2020-5624.md) | Dec 17, 2020 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | | Linux | thunderbird ol 8 | 0:78.6.0-1.0.1.el8_3 | [ELSA-2020-5624-1](https://patchblox.com/security/data/fix/linux/elsa-2020-5624-1.md) | Dec 18, 2020 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-78.8.1-build1-0ubuntu0.18.04.1.md) | Apr 22, 2021 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-78.7.1-build1-0ubuntu0.20.04.1.md) | Jan 25, 2021 | --- Data as of 2026-11-08T06:59:42Z UTC. 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