Mozilla Firefox ESR: When styling and rendering an oversized `<select>` element, Firefox did not apply correct clipping which…
CVE-2021-29961 is fixed in 4 products on 2 platforms, first by firefox 89.0+build2-0ubuntu0.18.04.2, released June 1, 2021. It is not reported as exploited. Patch Radar priority: Routine.
When styling and rendering an oversized `<select>` element, Firefox did not apply correct clipping which allowed an attacker to paint over the user interface. This vulnerability affects Firefox < 89.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox-geckodriver 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox-geckodriver 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox-mozsymbols 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox-mozsymbols 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
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