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OpenAdvisories
Unscored USN-5186-1 10 CVEs

firefox vulnerabilities

Published Dec 9, 2021 · Updated Apr 22, 2026

Ecosystem: Ubuntu

Summary

Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, conduct spoofing attacks, bypass CSP restrictions, or
execute arbitrary code. (CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546)

A security issue was discovered with the handling of WebExtension
permissions. If a user were tricked into installing a specially crafted
extension, an attacker could potentially exploit this to create and
install a service worker that wouldn't be uninstalled with the extension.
(CVE-2021-43540)

Fixed packages 2

ReleasePackageFixed in
Ubuntu · 18.04 LTS 18.04:LTS firefox 95.0+build1-0ubuntu0.18.04.1
Ubuntu · 20.04 LTS 20.04:LTS firefox 95.0+build1-0ubuntu0.20.04.1

Vulnerabilities 10

References

  • report
    https://ubuntu.com/security/CVE-2021-43536
  • report
    https://ubuntu.com/security/CVE-2021-43537
  • report
    https://ubuntu.com/security/CVE-2021-43538
  • report
    https://ubuntu.com/security/CVE-2021-43539
  • report
    https://ubuntu.com/security/CVE-2021-43540
  • report
    https://ubuntu.com/security/CVE-2021-43541
  • report
    https://ubuntu.com/security/CVE-2021-43542
  • report
    https://ubuntu.com/security/CVE-2021-43543
  • report
    https://ubuntu.com/security/CVE-2021-43545
  • report
    https://ubuntu.com/security/CVE-2021-43546