What’s Vulnerable › Vulnerabilities

CVE-2019-17657

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-07 · updated 2026-06-17
• Weakness: CWE-400

Description

An Uncontrolled Resource Consumption vulnerability in Fortinet FortiSwitch below 3.6.11, 6.0.6 and 6.2.2, FortiAnalyzer below 6.2.3, FortiManager below 6.2.3 and FortiAP-S/W2 below 6.2.2 may allow an attacker to cause admin webUI denial of service (DoS) via handling special crafted HTTP requests/responses in pieces slowly, as demonstrated by Slow HTTP DoS Attacks.

Affected products

• Fortinet FortiAnalyzer: before 6.2.3 — fixed in 6.2.3
• Fortinet FortiAP-S: before 6.2.2 — fixed in 6.2.2
• Fortinet FortiAP-W2: before 6.2.2 — fixed in 6.2.2
• Fortinet FortiManager: before 6.2.3 — fixed in 6.2.3
• Fortinet FortiSwitch: before 3.6.11; from 6.0.0 before 6.0.6; from 6.2.0 before 6.2.2 — fixed in 3.6.11, 6.0.6, 6.2.2

How to fix

Upgrade to a fixed version: Fortinet FortiAnalyzer 6.2.3; Fortinet FortiAP-S 6.2.2; Fortinet FortiAP-W2 6.2.2; Fortinet FortiManager 6.2.3; Fortinet FortiSwitch 3.6.11, 6.0.6, 6.2.2. Check the vendor advisory for mitigations.

References

• https://fortiguard.com/psirt/FG-IR-19-013
• https://fortiguard.com/psirt/FG-IR-19-013

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