CVE-2025-8037

CRITICAL EPSS 12.3%
Published Jul 22, 202511mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Jul 22, 2025 11mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
12.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-614

Affected Products 4

VendorProductVersionRange
mozillafirefox* <140.1
mozillafirefox* <141.0
mozillathunderbird* <140.1
mozillathunderbird* <141.0

References 5

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1964767
    Permissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-56/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-59/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-61/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-63/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.