CVE-2025-8037CRITICAL 9.1EPSS p11.0%

CVE-2025-8037CVE-2025-8037

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.21% probability of exploitation · percentile 11.0% · 2026-06-19T12:03:05Z
Published2025-07-22
Last modified2026-04-13

Underlying weaknesses· 1

CWE-614

References

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

1

TypeTargetConfidenceTier
WeaknessSensitive Cookie in HTTPS Session Without 'Secure' Attributecwe-6140%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.