Memory Safety Bugs in Firefox and Thunderbird Products by Mozilla
CVE-2025-1017

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
4 February 2025

What is CVE-2025-1017?

The vulnerability involves memory safety bugs identified in multiple versions of Firefox and Thunderbird, including Firefox 134 and Thunderbird 134. These memory corruption issues present a significant risk, as they potentially allow attackers to execute arbitrary code through specially crafted content. Users are advised to upgrade to the latest versions, Firefox 135 and Thunderbird 135, to mitigate this risk. Mozilla has released patches that address these vulnerabilities in its advisory, urging users to protect their systems by maintaining the latest software updates.

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Affected Version(s)

Firefox < 135

Firefox ESR < 128.7

Thunderbird < 128.7

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1926256%2...
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-09/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sebastian Hengst, Maurice Dauer and the Mozilla Fuzzing Team
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