CVE-2021-29971 json
If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port…
published 2021-08-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16430
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port - would be granted that permission. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 90.
Patch / fix
- Mozilla Firefox 90
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaFirefox openSUSE Tumbleweed 92.0-1.2
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1
Exploit prediction
1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Mozilla Firefox
Classification
- Weakness
-
- CWE-281 Improper Preservation of Permissions
References
-
mozilla.org
/security/advisories/mfsa2021-28/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1713638
issue-tracking, permissions-required
Sources
- CVE List CVE-2021-29971
- NVD CVE-2021-29971
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