Mozilla Firefox Security Updates – 04 May 2025

Mozilla has released an updated Firefox version 138, Firefox ESR versions 128.10, and 115.23 to fix multiple vulnerabilities.

The addressed vulnerabilities could allow the attacker to bypass security restrictions, obtain sensitive information, gain elevated privileges, execute arbitrary code, and gain access to the affected systems.

Sample of the addressed vulnerabilities:

1. Mozilla Firefox Improper Process Isolation Vulnerability (CVE-2025-4083):

  • CVSS: 9.1
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Consequences: Bypass Security

2. Mozilla Firefox Privilege Escalation Vulnerability (CVE-2025-2817):

  • CVSS: 8.8
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Consequences: Gain Privileges
Vulnerabilities
  • CVE-2025-2817
  • CVE-2025-4082
  • CVE-2025-4083
  • CVE-2025-4084
  • CVE-2025-4085
  • CVE-2025-4086
  • CVE-2025-4087
  • CVE-2025-4088
  • CVE-2025-4089
  • CVE-2025-4090
  • CVE-2025-4091
  • CVE-2025-4092
  • CVE-2025-4093
  • CVE-2025-3608
  • CVE-2025-3859
Mitigations

The enterprise should deploy this patch as soon as the testing phase is completed.

Mozilla Firefox Security Advisory

References