Back
CVE-2021-23957
Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox. Note: This issue only…
High7.4EPSS 0.79%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.79% · top 43% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Weakness
- Iframe sandbox could have been bypassed on Android via the intent URL scheme
Affected products
References (2)
- https://www.mozilla.org/security/advisories/mfsa2021-03/ (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1584582 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-23957)Record last updated .