What’s Vulnerable › Vulnerabilities

CVE-2019-17656

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-12 · updated 2026-06-17
• Weakness: CWE-787

Description

A Stack-based Buffer Overflow vulnerability in the HTTPD daemon of FortiOS 6.0.10 and below, 6.2.2 and below and FortiProxy 1.0.x, 1.1.x, 1.2.9 and below, 2.0.0 and below may allow an authenticated remote attacker to crash the service by sending a malformed PUT request to the server. Fortinet is not aware of any successful exploitation of this vulnerability that would lead to code execution.

Affected products

• Fortinet FortiOS (FortiGate): through 6.0.10; from 6.2.0 through 6.2.2
• Fortinet FortiProxy: from 1.0.0 before 1.2.10; from 2.0.0 before 2.0.2 — fixed in 1.2.10, 2.0.2

How to fix

Upgrade to a fixed version: Fortinet FortiProxy 1.2.10, 2.0.2. Check the vendor advisory for mitigations.

References

• https://fortiguard.com/advisory/FG-IR-19-248
• https://fortiguard.com/advisory/FG-IR-21-007
• https://fortiguard.com/advisory/FG-IR-19-248
• https://fortiguard.com/advisory/FG-IR-21-007

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