CVE-2025-8037

critical · 9.1

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.

9.1

CVSS

0.2%

EPSS (exploit prob.)

13th

EPSS percentile

2025-07-22

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-614

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 140.1
mozilla	firefox	< 141.0
mozilla	thunderbird	< 140.1
mozilla	thunderbird	< 141.0

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-8037