CVE-2019-17657Network attack vector

Admin webUI denial of service via slow HTTP

Published Apr 7, 2020 · Updated Oct 25, 2024

Uncontrolled resource consumption in Fortinet FortiSwitch, FortiAnalyzer, and FortiManager allows remote attackers to interrupt the admin webUI. The administrative HTTP server retains specially crafted requests or responses while their pieces arrive slowly, consuming connection-handling resources. No authentication or user interaction is required; the documented consequence is loss of administrative access, with no crash or reboot reported.

CVSS severity7.5
High
EPSS probability2.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Fortinet FortiSwitch, FortiAnalyzer, and FortiManager allows remote attackers to interrupt the admin webUI. The administrative HTTP server retains specially crafted requests or responses while their pieces arrive slowly, consuming connection-handling resources. No authentication or user interaction is required; the documented consequence is loss of administrative access, with no crash or reboot reported.

The record

CVE
CVE-2019-17657
Published
Apr 7, 2020
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiManager
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=below 6.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiManagerversion=below 6.2.3
Fortinet · FortiSwitchversion=6.0.6 and 6.2.2; version=below 3.6.11
Fortinet · FortiAnalyzerversion=below 6.2.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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