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Mozilla Firefox Denial of Service Vulnerability

September 9, 2026 · HKCERT · Severity: HIGH

A vulnerability was identified in Mozilla Firefox. A remote attacker could exploit some of these vulnerabilities to trigger denial of service condition on the targeted system. Impact Denial of Service System / Technologies affected Versions prior to:   Firefox for iOS 155.1 Solutions Before installation of the software, please visit the vendor web-site for more details. Apply fixes issued by the vendor:   Firefox for iOS 155.1

Key Takeaways

  • Active exploitation detected — patch immediately to prevent compromise
  • Affected systems should be identified and prioritized for remediation
  • Monitor for additional indicators of compromise as investigations evolve
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