Mozilla FireFox Security Updates – 20 December 2023

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Mozilla has released an updated Firefox version 121, and Firefox ESR version 115.6 to fix multiple vulnerabilities.

The addressed vulnerabilities could allow the remote attacker to obtain sensitive information, execute arbitrary code, and gain access to the affected system by persuading the victim to visit a specially crafted website.

Sample of the addressed vulnerabilities:

1. Mozilla Firefox Code Execution Vulnerability (CVE-2023-6873):

  • CVSS: 8.8
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Consequences: Gain Access

2. Mozilla Firefox Information Disclosure Vulnerability (CVE-2023-6856):

  • CVSS: 6.5
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Consequences: Obtain Information
Vulnerabilities
  • CVE-2023-6135
  • CVE-2023-6856
  • CVE-2023-6857
  • CVE-2023-6858
  • CVE-2023-6859
  • CVE-2023-6860
  • CVE-2023-6861
  • CVE-2023-6862
  • CVE-2023-6863
  • CVE-2023-6864
  • CVE-2023-6865
  • CVE-2023-6866
  • CVE-2023-6867
  • CVE-2023-6868
  • CVE-2023-6869
  • CVE-2023-6870
  • CVE-2023-6871
  • CVE-2023-6872
  • CVE-2023-6873
  • CVE-2023-4421
Mitigations

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

References