CVE-2019-5591

CRITICALNVD 6.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 307 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
  • Linked to ransomware campaigns
CISA-KEV: ExploitedEPSS PROB: 18%CVSS: 6.5Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · public exploitExposed: 307

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

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.

Live · internet exposure

307 internet-exposed hosts are running an affected version of CVE-2019-5591 right now.

across 24 countries (United States, Canada, India, Brazil, Japan)top: fortios🔒 ransomware-linked
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
6.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
18%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

August 14, 2020

Last Modified

August 15, 2026

Advisory Details (2)

Auto-updated Jun 12, 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-2019-5591
generic

PSIRT | FortiGuard Labs

https://www.fortiguard.com/psirt/FG-IR-19-037

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 231× 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 836 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Nucleihttp/cves/2019/CVE-2019-5591.yaml
    First seen Jan 1, 2019

    FortiOS - Insecure LDAP Configuration Detection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2019-5591?
CVE-2019-5591 is a critical vulnerability published on August 14, 2020. A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
When was CVE-2019-5591 disclosed?
CVE-2019-5591 was first published in the National Vulnerability Database on August 14, 2020, with the most recent update on August 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-5591 actively exploited?
Yes. CISA added CVE-2019-5591 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Fortinet FortiOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-5591?
CVE-2019-5591 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2019-5591?
CVE-2019-5591 affects Fortinet FortiOS. 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-2019-5591?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-5591, 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-2019-5591

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