CVE-2021-43530
A Universal XSS vulnerability was present in Firefox for Android resulting from improper...
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 94.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 94.
- Record
CVE-2021-43530- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 94.
- Record
CVE-2021-43530- Updated
- 2026-11-02
EUVDEUVD-2021-30459 No score
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 94.
- Record
EUVD-2021-30459- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mgfp-hcp6-39f4 No score
A Universal XSS vulnerability was present in Firefox for Android resulting from improper...
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 94.
- Record
GHSA-mgfp-hcp6-39f4- Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | hfh86/CVE-2021-43530-UXSS-On-QRcode-Reader- | 2022-03-22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43530 is a medium vulnerability (CVSS 6.1) in Mozilla Firefox, published December 8, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.41%, the 72nd percentile. No source names a fixed version.