CVE-2025-8037

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2025-07-22. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
9.1
EG Score
9.1(medium)
EPSS
12.2%
KEV
Not listed

Published

July 22, 2025

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated May 21, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-63/
generic

Security Vulnerabilities fixed in Thunderbird 141 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-61/
generic

Security Vulnerabilities fixed in Firefox ESR 140.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-59/
generic

Security Vulnerabilities fixed in Firefox 141 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-56/
generic

1964767 - (CVE-2025-8037) Nameless cookies can be used to shadow Secure cookies from an insecure connection

https://bugzilla.mozilla.org/show_bug.cgi?id=1964767

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:140.7.1+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:30 UTCEPSS rescore
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  1. 2026-07-05 02:30 UTCEPSS rescore
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  22. 2026-06-21 14:56 UTCEPSS rescore
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  24. 2026-06-21 01:59 UTCEPSS rescore
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  26. 2026-06-19 19:25 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
  28. 2026-06-18 17:52 UTCEPSS rescore
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  41. 2026-06-08 14:17 UTCEPSS rescore
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  43. 2026-06-07 15:24 UTCEPSS rescore
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  45. 2026-06-06 13:47 UTCEPSS rescore
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  47. 2026-06-05 22:47 UTCEPSS rescore
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  49. 2026-06-05 06:10 UTCEPSS rescore
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  51. 2026-06-04 13:12 UTCEPSS rescore
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  75. 2026-05-24 16:58 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-8037?
CVE-2025-8037 is a critical vulnerability published on July 22, 2025. 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.
When was CVE-2025-8037 disclosed?
CVE-2025-8037 was first published in the National Vulnerability Database on July 22, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-8037 actively exploited?
CVE-2025-8037 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-8037?
CVE-2025-8037 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-8037?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-8037, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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