CVE-2018-13383

CRITICALNVD 4.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-01-10), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 4.3 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.
  • 4 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: 34%CVSS: 4.3Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed: 4

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

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

Live · internet exposure

4 internet-exposed hosts are running an affected version of CVE-2018-13383 right now.

across 4 countries (India, Italy, Thailand, United States)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
4.3
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
34%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

May 29, 2019

Last Modified

October 24, 2025

Advisory Details (1)

Auto-updated Jun 15, 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-2018-13383

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 58× in last 7d / 249× 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 947 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-13383?
CVE-2018-13383 is a critical vulnerability published on May 29, 2019. A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle…
When was CVE-2018-13383 disclosed?
CVE-2018-13383 was first published in the National Vulnerability Database on May 29, 2019, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-13383 actively exploited?
Yes. CISA added CVE-2018-13383 to the Known Exploited Vulnerabilities catalog on January 10, 2022, affecting Fortinet FortiOS and FortiProxy. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-13383?
CVE-2018-13383 has a CVSS v3 base score of 4.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-13383?
CVE-2018-13383 affects Fortinet FortiOS and FortiProxy. 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-2018-13383?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-13383, 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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