Multiple vulnerabilities in Mozilla Firefox ESR

Description

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to bypass security restrictions, execute arbitrary code.

Below is a complete list of vulnerabilities:

1. Validation of untrusted input vulnerability can be exploited to bypass security restrictions.
2. A remote code execution vulnerability in the “Copy as cURL” feature can be exploited remotely to execute arbitrary code.
3. Use after free vulnerability in media can be exploited to cause denial of service or execute arbitrary code.

Original advisories

• MFSA2025-43

Exploitation

Public exploits exist for this vulnerability.

Related products

• Mozilla-Firefox-ESR

CVE list

• CVE-2025-5263
  warning
• CVE-2025-5264
  warning
• CVE-2025-5265
  warning
• CVE-2025-5283
  high

Read more

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