CVE-2025-59718

CRITICALPre-NVD 9.19.8▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-12-16), indicating real-world exploitation has been confirmed by US federal agencies. the CNA's CVSS baseline 9.1 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, cna:fortinet, epss, ghsa
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 63%CVSS: 9.1Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

CVSS v3
9.1
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
63%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

December 9, 2025

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Jun 20, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718
generic

SSA-864900

https://cert-portal.siemens.com/productcert/html/ssa-864900.html
generic🔴 Active Exploitation

Arctic Wolf Observes Malicious SSO Logins on FortiGate Devices Following Disclosure of CVE-2025-59718 and CVE-2025-59719 - Arctic Wolf

https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/
generic

PSIRT | FortiGuard Labs

https://fortiguard.fortinet.com/psirt/FG-IR-25-647

Vendor Advisories for CVE-2025-59718(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 44× in last 7d / 227× 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 465 total refreshes for this CVE.

  1. 2026-07-28 01:50 UTCGHSA enrichment
  2. 2026-07-27 22:09 UTCGHSA enrichment
  3. 2026-07-27 19:24 UTCCISA KEV update
  4. 2026-07-27 18:27 UTCGHSA enrichment
  5. 2026-07-27 17:17 UTCCISA KEV update
  6. 2026-07-27 14:46 UTCGHSA enrichment
  7. 2026-07-27 10:47 UTCGHSA enrichment
  8. 2026-07-27 07:08 UTCGHSA enrichment
  9. 2026-07-27 03:27 UTCGHSA enrichment
  10. 2026-07-26 23:46 UTCGHSA enrichment
  11. 2026-07-26 20:05 UTCGHSA enrichment
  12. 2026-07-26 16:25 UTCEG score recompute
  13. 2026-07-26 16:25 UTCGHSA enrichment
  14. 2026-07-26 14:54 UTCEPSS rescore
  15. 2026-07-26 12:44 UTCEG score recompute
  16. 2026-07-26 12:44 UTCGHSA enrichment
  17. 2026-07-26 09:03 UTCGHSA enrichment
  18. 2026-07-26 05:22 UTCGHSA enrichment
  19. 2026-07-26 01:40 UTCEG score recompute
  20. 2026-07-26 01:40 UTCGHSA enrichment
  21. 2026-07-25 14:17 UTCEPSS rescore
  22. 2026-07-24 14:17 UTCEPSS rescore
  23. 2026-07-23 14:18 UTCEPSS rescore
  24. 2026-07-23 03:00 UTCEG score recompute
  25. 2026-07-22 21:36 UTCEG score recompute
Show 75 more
  1. 2026-07-22 21:36 UTCGHSA enrichment
  2. 2026-07-22 21:18 UTCGHSA enrichment
  3. 2026-07-22 19:40 UTCCISA KEV update
  4. 2026-07-22 17:37 UTCEG score recompute
  5. 2026-07-22 17:37 UTCGHSA enrichment
  6. 2026-07-22 14:08 UTCEPSS rescore
  7. 2026-07-22 14:07 UTCEPSS rescore
  8. 2026-07-22 13:57 UTCGHSA enrichment
  9. 2026-07-22 10:17 UTCGHSA enrichment
  10. 2026-07-22 06:37 UTCGHSA enrichment
  11. 2026-07-22 02:57 UTCGHSA enrichment
  12. 2026-07-21 23:17 UTCGHSA enrichment
  13. 2026-07-21 19:16 UTCGHSA enrichment
  14. 2026-07-21 15:35 UTCEG score recompute
  15. 2026-07-21 15:35 UTCGHSA enrichment
  16. 2026-07-21 15:24 UTCEPSS rescore
  17. 2026-07-21 14:37 UTCCISA KEV update
  18. 2026-07-21 11:54 UTCGHSA enrichment
  19. 2026-07-21 08:14 UTCGHSA enrichment
  20. 2026-07-21 04:34 UTCGHSA enrichment
  21. 2026-07-21 00:54 UTCGHSA enrichment
  22. 2026-07-20 21:14 UTCGHSA enrichment
  23. 2026-07-20 17:34 UTCEG score recompute
  24. 2026-07-20 17:34 UTCGHSA enrichment
  25. 2026-07-20 17:08 UTCEPSS rescore
  26. 2026-07-20 13:54 UTCGHSA enrichment
  27. 2026-07-20 10:14 UTCGHSA enrichment
  28. 2026-07-20 06:33 UTCGHSA enrichment
  29. 2026-07-20 02:50 UTCGHSA enrichment
  30. 2026-07-19 23:09 UTCGHSA enrichment
  31. 2026-07-19 19:29 UTCGHSA enrichment
  32. 2026-07-19 15:49 UTCEG score recompute
  33. 2026-07-19 15:49 UTCGHSA enrichment
  34. 2026-07-19 14:30 UTCEPSS rescore
  35. 2026-07-19 14:30 UTCEPSS rescore
  36. 2026-07-19 12:08 UTCGHSA enrichment
  37. 2026-07-19 08:29 UTCGHSA enrichment
  38. 2026-07-19 04:49 UTCGHSA enrichment
  39. 2026-07-19 01:08 UTCGHSA enrichment
  40. 2026-07-18 21:29 UTCGHSA enrichment
  41. 2026-07-18 17:49 UTCGHSA enrichment
  42. 2026-07-18 14:09 UTCGHSA enrichment
  43. 2026-07-18 10:29 UTCGHSA enrichment
  44. 2026-07-18 06:49 UTCGHSA enrichment
  45. 2026-07-18 03:09 UTCGHSA enrichment
  46. 2026-07-17 23:29 UTCGHSA enrichment
  47. 2026-07-17 19:49 UTCGHSA enrichment
  48. 2026-07-17 16:09 UTCGHSA enrichment
  49. 2026-07-17 12:29 UTCGHSA enrichment
  50. 2026-07-17 08:49 UTCEG score recompute
  51. 2026-07-17 08:49 UTCGHSA enrichment
  52. 2026-07-17 05:08 UTCGHSA enrichment
  53. 2026-07-17 01:28 UTCGHSA enrichment
  54. 2026-07-16 21:48 UTCGHSA enrichment
  55. 2026-07-16 18:07 UTCGHSA enrichment
  56. 2026-07-16 17:04 UTCCISA KEV update
  57. 2026-07-16 17:02 UTCEPSS rescore
  58. 2026-07-16 14:26 UTCGHSA enrichment
  59. 2026-07-16 10:46 UTCGHSA enrichment
  60. 2026-07-16 07:06 UTCGHSA enrichment
  61. 2026-07-16 03:26 UTCGHSA enrichment
  62. 2026-07-15 23:46 UTCGHSA enrichment
  63. 2026-07-15 20:06 UTCGHSA enrichment
  64. 2026-07-15 16:57 UTCEPSS rescore
  65. 2026-07-15 16:57 UTCEPSS rescore
  66. 2026-07-15 16:49 UTCCISA KEV update
  67. 2026-07-15 16:26 UTCGHSA enrichment
  68. 2026-07-15 15:04 UTCCISA KEV update
  69. 2026-07-15 12:47 UTCGHSA enrichment
  70. 2026-07-15 09:07 UTCGHSA enrichment
  71. 2026-07-15 05:26 UTCGHSA enrichment
  72. 2026-07-15 01:59 UTCEPSS rescore
  73. 2026-07-15 01:59 UTCEPSS rescore
  74. 2026-07-15 01:45 UTCGHSA enrichment
  75. 2026-07-14 22:05 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmoften/CVE-2025-59718-Fortinet-Poc
    First seen Dec 27, 2025

    PoC para determinar si Fortinet es vulnerable a CVE-2025-59718 / CVE-2025-59719

    Open source ↗
  • GitHub PoCexfil0/CVE-2025-59718-PoC
    First seen Dec 17, 2025

    Fortinet announced two closely related authentication‑bypass vulnerabilities on 9 December 2025. Both flaws involve improper verification of cryptographic signatures (CWE‑347) in the handling of SAML responses for the FortiCloud SSO login feature.

    Open source ↗

Frequently asked(6)

What is CVE-2025-59718?
CVE-2025-59718 is a critical vulnerability published on December 9, 2025. A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14,…
When was CVE-2025-59718 disclosed?
CVE-2025-59718 was first published in the National Vulnerability Database on December 9, 2025, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-59718 actively exploited?
Yes. CISA added CVE-2025-59718 to the Known Exploited Vulnerabilities catalog on December 16, 2025, affecting Fortinet Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-59718?
CVE-2025-59718 has a CVSS v4.0 base score of 9.1 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
Which products are affected by CVE-2025-59718?
CVE-2025-59718 affects Fortinet Multiple Products. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-59718?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-59718, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-59718

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