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.
  • 5 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 68%CVSS: 9.1Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 5

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.

Live · internet exposure

5 internet-exposed hosts are running an affected version of CVE-2025-59718 right now.

across 5 countries (Canada, Indonesia, South Africa, Sweden, United States)top: fortios
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

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
68%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

December 9, 2025

Last Modified

August 11, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Just a moment

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

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 61× in last 7d / 260× 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 927 total refreshes for this CVE.

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

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 August 11, 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

Explore →

Is Your Infrastructure Affected by CVE-2025-59718?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs