Use-After-Free Vulnerability in Firefox and Thunderbird Products by Mozilla
CVE-2025-1009

9.8CRITICAL

Key Information:

Vendor

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

What is CVE-2025-1009?

A vulnerability exists in Mozilla's Firefox and Thunderbird products that could be exploited through crafted XSLT data, potentially leading to application crashes. Attackers may leverage this condition to disrupt services, highlighting the importance of maintaining updated versions to mitigate risks associated with this insecure implementation.

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Affected Version(s)

Firefox < 135

Firefox ESR < 115.20

Firefox ESR < 128.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1936613
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-08/

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

Ivan Fratric of Google Project Zero
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