Multiple vulnerabilities in Mozilla Firefox ESR

Description

Multiple vulnerabilities were found in Mozilla Firefox ESR. Malicious users can exploit these vulnerabilities to execute arbitrary code, cause denial of service.

Below is a complete list of vulnerabilities:

1. Memory safety vulnerability can be exploited to execute arbitrary code.
2. Use after free vulnerability in XSLT can be exploited to cause denial of service or execute arbitrary code.
3. Use after free vulnerability can be exploited to cause denial of service or execute arbitrary code.
4. Use after free vulnerability in Custom Highlight can be exploited to cause denial of service or execute arbitrary code.

Original advisories

• MFSA2025-08

Exploitation

Public exploits exist for this vulnerability.

Related products

• Mozilla-Firefox-ESR

CVE list

• CVE-2025-1017
  critical
• CVE-2025-1009
  critical
• CVE-2025-1012
  critical
• CVE-2025-1016
  critical
• CVE-2025-1010
  critical

Read more

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