# CVE-2020-15677: Firefox ESR and 2 others: By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed… CVE-2020-15677 is fixed in 11 products on 2 platforms, first by RHSA-2020:3832, released September 24, 2020. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2020-15677 - Priority: Routine - CVSS: 6.1 (Important) - EPSS: 0.0166 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 24, 2020 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-15677 ## Description By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 91.0 | [Mozilla Firefox ESR (en-US) 91.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-91.0.md) | Aug 4, 2021 | | Windows apps | Mozilla Thunderbird (en-US) | 78.4.0 | [Mozilla Thunderbird (en-US) 78.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-78.4.0.md) | Oct 19, 2020 | | Linux | firefox RHEL 8 | 0:78.3.0-1.el8_2 | [RHSA-2020:3832](https://patchblox.com/security/data/fix/linux/rhsa-2020-3832.md) | Sep 24, 2020 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 81.0+build2-0ubuntu0.18.04.1 | [firefox 81.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-81.0-build2-0ubuntu0.18.04.1.md) | Sep 24, 2020 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 81.0+build2-0ubuntu0.20.04.1 | [firefox 81.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-81.0-build2-0ubuntu0.20.04.1.md) | Sep 24, 2020 | | Linux | firefox ol 8 | 0:78.3.0-1.0.1.el8_2 | [ELSA-2020-3832](https://patchblox.com/security/data/fix/linux/elsa-2020-3832.md) | Sep 24, 2020 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 81.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 81.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-81.0-build2-0ubuntu0.18.04.1.md) | Sep 24, 2020 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 81.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 81.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-81.0-build2-0ubuntu0.20.04.1.md) | Sep 24, 2020 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 81.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 81.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-81.0-build2-0ubuntu0.18.04.1.md) | Sep 24, 2020 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 81.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 81.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-81.0-build2-0ubuntu0.20.04.1.md) | Sep 24, 2020 | | Linux | thunderbird RHEL 8 | 0:78.3.1-1.el8_2 | [RHSA-2020:4155](https://patchblox.com/security/data/fix/linux/rhsa-2020-4155.md) | Oct 1, 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 | 0:78.3.1-1.0.1.el8_2 | [ELSA-2020-4155](https://patchblox.com/security/data/fix/linux/elsa-2020-4155.md) | Oct 4, 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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