# CVE-2022-45403: Mozilla Firefox and 4 others: Observable Discrepancy CVE-2022-45403 is fixed in 13 products on 2 platforms, first by Mozilla Firefox (en-US) 107.0, released November 15, 2022. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2022-45403 - Priority: High - CVSS: 9.8 (Important) - EPSS: 0.0074 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 14, 2022 - Weakness: CWE-203: Observable Discrepancy - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-45403 ## Description Service Workers should not be able to infer information about opaque cross-origin responses; but timing information for cross-origin media combined with Range requests might have allowed them to determine the presence or length of a media file. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox (en-US) | 107.0 | [Mozilla Firefox (en-US) 107.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-107.0.md) | Nov 15, 2022 | | Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 | | Windows apps | Mozilla Thunderbird (en-US) | 102.6.0 | [Mozilla Thunderbird (en-US) 102.6.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-102.6.0.md) | Dec 12, 2022 | | Linux | firefox RHEL 8 | 0:102.5.0-1.el8_7 | [RHSA-2022:8554](https://patchblox.com/security/data/fix/linux/rhsa-2022-8554.md) | Nov 21, 2022 | | Linux | firefox RHEL 9 | 0:102.5.0-1.el9_1 | [RHSA-2022:8580](https://patchblox.com/security/data/fix/linux/rhsa-2022-8580.md) | Nov 22, 2022 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 107.0+build2-0ubuntu0.18.04.1 | [firefox 107.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-107.0-build2-0ubuntu0.18.04.1.md) | Nov 15, 2022 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 107.0+build2-0ubuntu0.20.04.1 | [firefox 107.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-107.0-build2-0ubuntu0.20.04.1.md) | Dec 22, 2022 | | Linux | firefox almalinux 8 | 102.5.0-1.el8_7.alma | [ALSA-2022:8554](https://patchblox.com/security/data/fix/linux/alsa-2022-8554.md) | Nov 21, 2022 | | Linux | firefox almalinux 9 | 102.5.0-1.el9_1.alma | [ALSA-2022:8580](https://patchblox.com/security/data/fix/linux/alsa-2022-8580.md) | Nov 22, 2022 | | Linux | firefox ol 8 | 0:102.5.0-1.0.1.el8_7 | [ELSA-2022-8554](https://patchblox.com/security/data/fix/linux/elsa-2022-8554.md) | Nov 22, 2022 | | Linux | firefox ol 9 | 0:102.5.0-1.0.1.el9_1 | [ELSA-2022-8580](https://patchblox.com/security/data/fix/linux/elsa-2022-8580.md) | Nov 24, 2022 | | Linux | firefox rocky 8 | 0:102.5.0-1.el8_7 | [RLSA-2022:8554](https://patchblox.com/security/data/fix/linux/rlsa-2022-8554.md) | Nov 21, 2022 | | Linux | firefox-esr Debian 11.6 (bullseye) | 102.5.0esr-1~deb11u1 | [DSA-5282-1](https://patchblox.com/security/data/fix/linux/dsa-5282-1.md) | Nov 16, 2022 | | Linux | firefox-esr Debian 12.15 (bookworm) | 102.5.0esr-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | firefox-esr Debian 13.5 (trixie) | 102.5.0esr-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | firefox-esr Debian 14 | 102.5.0esr-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 107.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 107.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-107.0-build2-0ubuntu0.18.04.1.md) | Nov 15, 2022 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 107.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 107.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-107.0-build2-0ubuntu0.20.04.1.md) | Dec 22, 2022 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 107.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 107.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-107.0-build2-0ubuntu0.18.04.1.md) | Nov 15, 2022 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 107.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 107.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-107.0-build2-0ubuntu0.20.04.1.md) | Dec 22, 2022 | | Linux | thunderbird Debian 11.6 (bullseye) | 1:102.5.0-1~deb11u1 | [DSA-5284-1](https://patchblox.com/security/data/fix/linux/dsa-5284-1.md) | Nov 17, 2022 | | Linux | thunderbird Debian 12.15 (bookworm) | 1:102.5.0-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | thunderbird Debian 13.5 (trixie) | 1:102.5.0-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | thunderbird Debian 14 | 1:102.5.0-1 | [DEBIAN-CVE-2022-45403](https://patchblox.com/security/data/fix/linux/debian-cve-2022-45403.md) | Dec 22, 2022 | | Linux | thunderbird RHEL 8 | 0:102.5.0-2.el8_7 | [RHSA-2022:8547](https://patchblox.com/security/data/fix/linux/rhsa-2022-8547.md) | Nov 21, 2022 | | Linux | thunderbird RHEL 9 | 0:102.5.0-2.el9_1 | [RHSA-2022:8561](https://patchblox.com/security/data/fix/linux/rhsa-2022-8561.md) | Nov 21, 2022 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [thunderbird 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [thunderbird 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [thunderbird 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | | Linux | thunderbird almalinux 8 | 102.5.0-2.el8_7.alma | [ALSA-2022:8547](https://patchblox.com/security/data/fix/linux/alsa-2022-8547.md) | Nov 21, 2022 | | Linux | thunderbird almalinux 9 | 102.5.0-2.el9_1.alma | [ALSA-2022:8561](https://patchblox.com/security/data/fix/linux/alsa-2022-8561.md) | Nov 21, 2022 | | Linux | thunderbird ol 8 | 0:102.5.0-2.0.1.el8_7 | [ELSA-2022-8547](https://patchblox.com/security/data/fix/linux/elsa-2022-8547.md) | Nov 22, 2022 | | Linux | thunderbird ol 9 | 0:102.5.0-2.0.1.el9_1 | [ELSA-2022-8561](https://patchblox.com/security/data/fix/linux/elsa-2022-8561.md) | Nov 24, 2022 | | Linux | thunderbird rocky 8 | 0:102.5.0-2.el8_7 | [RLSA-2022:8547](https://patchblox.com/security/data/fix/linux/rlsa-2022-8547.md) | Nov 21, 2022 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [thunderbird-gnome-support 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [thunderbird-mozsymbols 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [xul-ext-calendar-timezones 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [xul-ext-gdata-provider 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:102.7.1+build2-0ubuntu0.18.04.1 | [xul-ext-lightning 1:102.7.1+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-102.7.1-build2-0ubuntu0.18.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:102.7.1+build2-0ubuntu0.20.04.1 | [xul-ext-lightning 1:102.7.1+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-102.7.1-build2-0ubuntu0.20.04.1.md) | Jan 17, 2023 | | Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:102.7.1+build2-0ubuntu0.22.04.1 | [xul-ext-lightning 1:102.7.1+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-102.7.1-build2-0ubuntu0.22.04.1.md) | Jan 17, 2023 | --- Data as of 2026-11-08T19:12:23Z UTC. 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