Memory Safety Bugs in Firefox and Thunderbird Affecting Mozilla Products
CVE-2025-5272

7.3HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
27 May 2025

What is CVE-2025-5272?

Mozilla's Firefox and Thunderbird versions prior to 139 contain memory safety bugs that have been identified as potential risks. These vulnerabilities demonstrate signs of memory corruption, which could be leveraged by attackers to execute arbitrary code if successfully exploited. Users are urged to update to the latest versions to mitigate these security concerns.

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Affected Version(s)

Firefox < 139

Thunderbird < 139

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1726254%2...
https://www.mozilla.org/security/advisories/mfsa2025-42/
https://www.mozilla.org/security/advisories/mfsa2025-45/

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

the Mozilla Fuzzing Team, Andrew Osmond
JSON
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