CVE-2025-8037

CRITICAL

Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird ...

Title source: llm
STIX 2.1

Description

Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

References (5)

Core 5

Scores

CVSS v3 9.1
EPSS 0.0022
EPSS Percentile 44.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-614
Status published
Products (8)
mozilla/firefox < 140.1
mozilla/firefox < 141.0
Mozilla/Firefox 140.1 - 140.*
Mozilla/Firefox 141
mozilla/thunderbird < 140.1
mozilla/thunderbird < 141.0
Mozilla/Thunderbird 140.1 - 140.*
Mozilla/Thunderbird 141
Published Jul 22, 2025
Tracked Since Feb 18, 2026