# CVE-2021-24000: Firefox ESR and 1 other: A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting… CVE-2021-24000 is fixed in 4 products on 2 platforms, first by firefox 88.0+build2-0ubuntu0.18.04.2, released April 25, 2021. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2021-24000 - Priority: Routine - CVSS: 3.1 (Medium) - EPSS: 0.0061 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 18, 2021 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-24000 ## Description A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting with one tab when they believed they were on a separate tab. In conjunction with certain elements (such as <input type="file">) this could have led to an attack where a user was confused about the origin of the webpage and potentially disclosed information they did not intend to. This vulnerability affects Firefox < 88. ## 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 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 88.0+build2-0ubuntu0.18.04.2 | [firefox 88.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-88.0-build2-0ubuntu0.18.04.2.md) | Apr 25, 2021 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 88.0+build2-0ubuntu0.20.04.1 | [firefox 88.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-88.0-build2-0ubuntu0.20.04.1.md) | Apr 25, 2021 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 88.0+build2-0ubuntu0.18.04.2 | [firefox-geckodriver 88.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-88.0-build2-0ubuntu0.18.04.2.md) | Apr 25, 2021 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 88.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 88.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-88.0-build2-0ubuntu0.20.04.1.md) | Apr 25, 2021 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 88.0+build2-0ubuntu0.18.04.2 | [firefox-mozsymbols 88.0+build2-0ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-88.0-build2-0ubuntu0.18.04.2.md) | Apr 25, 2021 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 88.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 88.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-88.0-build2-0ubuntu0.20.04.1.md) | Apr 25, 2021 | --- Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.