CVE-2019-17657 — 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

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HIGH

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

Published Apr 7, 2020

7.5

HIGH

CVSS 3.1

EPSS 2.44%

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

Vendor n/a Product FortiAP-S/W2 Default
n/a
- Version
  below 6.2.2
  Status
  affected
  Constraints
  -
Vendor n/a Product FortiAnalyzer Default
n/a
- Version
  below 6.2.3
  Status
  affected
  Constraints
  -
Vendor n/a Product FortiManager Default
n/a
- Version
  below 6.2.3
  Status
  affected
  Constraints
  -
Vendor n/a Product Fortinet FortiSwitch Default
n/a
- Version
  6.0.6 and 6.2.2
  Status
  affected
  Constraints
  -
- Version
  below 3.6.11
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

n/a

FortiAP-S/W2

n/a

Version	Status	Constraints
below 6.2.2	affected	-

n/a

FortiAnalyzer

n/a

Version	Status	Constraints
below 6.2.3	affected	-

n/a

FortiManager

n/a

Version	Status	Constraints
below 6.2.3	affected	-

n/a

Fortinet FortiSwitch

n/a

Version	Status	Constraints
6.0.6 and 6.2.2	affected	-
below 3.6.11	affected	-

Remediation

No remediation recorded yet.

Metrics

2.44% 0.02445

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.02445

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	2.44% (0.02445)	83.77th	v5 (v2026.06.15)
Jun 15, 2026	2.38% (0.02385)	81.68th	v5 (v2026.06.15)
Jul 20, 2024	0.45% (0.00450)	75.34th	v3 (v2023.03.01)
Feb 8, 2024	0.45% (0.00450)	74.34th	v3 (v2023.03.01)
Mar 7, 2023	0.45% (0.00450)	71.13th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	5.46% (0.05463)	76.57th	v2 (v2022.01.01)
Feb 3, 2022	2.42% (0.02423)	53.93th	v5 (v2026.06.15)
Jan 6, 2022	2.42% (0.02423)	53.48th	v1
Sep 1, 2021	0.55% (0.00550)	32.48th	v1
Apr 14, 2021	0.55% (0.00550)	0.00th	v1