Denial-of-Service Vulnerability in Firefox and Thunderbird WebRender Components
CVE-2025-9182

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
19 August 2025

What is CVE-2025-9182?

This vulnerability in the WebRender component of Firefox and Thunderbird can lead to a denial-of-service condition due to an out-of-memory error. It affects several versions of Firefox and Thunderbird, making it crucial for users to update their software to ensure protection against potential crashes and service interruptions.

Affected Version(s)

Firefox < 142

Firefox ESR < 140.2

Thunderbird < 142

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1975837
https://www.mozilla.org/security/advisories/mfsa2025-64/
https://www.mozilla.org/security/advisories/mfsa2025-67/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Irvan Kurniawan
.
CVE-2025-9182 : Denial-of-Service Vulnerability in Firefox and Thunderbird WebRender Components