# CVE-2020-6831: Firefox ESR: A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. CVE-2020-6831 is fixed in 15 products on 2 platforms, first by RHSA-2020:2031, released May 6, 2020. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2020-6831 - Priority: Urgent - CVSS: 9.8 (Critical) - EPSS: 0.0580 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 5, 2020 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-6831 ## Description A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 78.0esr | [Mozilla Firefox ESR (en-US) 78.0esr](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-78.0esr.md) | Jun 25, 2020 | | Linux | chromium-browser Ubuntu 18.04.6 LTS (bionic) | 81.0.4044.138-0ubuntu0.18.04.1 | [chromium-browser 81.0.4044.138-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-81.0.4044.138-0ubuntu0.18.04.1.md) | May 20, 2020 | | Linux | chromium-browser-l10n Ubuntu 18.04.6 LTS (bionic) | 81.0.4044.138-0ubuntu0.18.04.1 | [chromium-browser-l10n 81.0.4044.138-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-l10n-81.0.4044.138-0ubuntu0.18.04.1.md) | May 20, 2020 | | Linux | chromium-chromedriver Ubuntu 18.04.6 LTS (bionic) | 81.0.4044.138-0ubuntu0.18.04.1 | [chromium-chromedriver 81.0.4044.138-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-chromedriver-81.0.4044.138-0ubuntu0.18.04.1.md) | May 20, 2020 | | Linux | chromium-codecs-ffmpeg Ubuntu 18.04.6 LTS (bionic) | 81.0.4044.138-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg 81.0.4044.138-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-81.0.4044.138-0ubuntu0.18.04.1.md) | May 20, 2020 | | Linux | chromium-codecs-ffmpeg-extra Ubuntu 18.04.6 LTS (bionic) | 81.0.4044.138-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg-extra 81.0.4044.138-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-extra-81.0.4044.138-0ubuntu0.18.04.1.md) | May 20, 2020 | | Linux | firefox RHEL 8 | 0:68.8.0-1.el8_2 | [RHSA-2020:2031](https://patchblox.com/security/data/fix/linux/rhsa-2020-2031.md) | May 6, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | [firefox 76.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-76.0-build2-0ubuntu0.18.04.1.md) | May 6, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | [firefox 76.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-76.0-build2-0ubuntu0.20.04.1.md) | May 6, 2020 | | Linux | firefox ol 8 | 0:68.8.0-1.0.1.el8_2 | [ELSA-2020-2031](https://patchblox.com/security/data/fix/linux/elsa-2020-2031.md) | May 9, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 76.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-76.0-build2-0ubuntu0.18.04.1.md) | May 6, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 76.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-76.0-build2-0ubuntu0.20.04.1.md) | May 6, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 76.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-76.0-build2-0ubuntu0.18.04.1.md) | May 6, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 76.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-76.0-build2-0ubuntu0.20.04.1.md) | May 6, 2020 | | Linux | thunderbird RHEL 8 | 0:68.8.0-1.el8_2 | [RHSA-2020:2046](https://patchblox.com/security/data/fix/linux/rhsa-2020-2046.md) | May 11, 2020 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [thunderbird 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [thunderbird 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | | Linux | thunderbird ol 8 | 0:68.8.0-1.0.1.el8_2 | [ELSA-2020-2046](https://patchblox.com/security/data/fix/linux/elsa-2020-2046.md) | May 12, 2020 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [thunderbird-gnome-support 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [thunderbird-gnome-support 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [thunderbird-mozsymbols 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [thunderbird-mozsymbols 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [xul-ext-calendar-timezones 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [xul-ext-calendar-timezones 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [xul-ext-gdata-provider 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [xul-ext-gdata-provider 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:68.8.0+build2-0ubuntu0.18.04.2 | [xul-ext-lightning 1:68.8.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-68.8.0-build2-0ubuntu0.18.04.2.md) | May 6, 2020 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:68.8.0+build2-0ubuntu0.20.04.2 | [xul-ext-lightning 1:68.8.0+build2-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-68.8.0-build2-0ubuntu0.20.04.2.md) | May 6, 2020 | --- Data as of 2026-11-08T00:53:09Z UTC. 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