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Fencer Vulns
medium 6.1

CVE-2021-43544 json

When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have c…

published 2021-12-08 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30473

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and spoofing attacks. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.

Patch / fix

  • Mozilla Firefox 95
  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 95.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:11669-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 95.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 95.0-r0

alpine advisories ALPINE-CVE-2021-43544

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.