CVE-2021-26088

HIGH

Fortinet Single Sign-on < 6.4.6 - Authentication Bypass

Title source: rule
STIX 2.1

Description

An improper authentication vulnerability in FSSO Collector version 5.0.295 and below may allow an unauthenticated user to bypass a FSSO firewall policy and access the protected network via sending specifically crafted UDP login notification packets.

Exploits (1)

nomisec WORKING POC 3 stars
by theogobinet · poc
https://github.com/theogobinet/CVE-2021-26088

References (1)

Core 1
Core References
Vendor Advisory x_refsource_confirm
https://fortiguard.com/advisory/FG-IR-20-191

Scores

CVSS v3 7.1
EPSS 0.0548
EPSS Percentile 90.3%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-287
Status published
Products (1)
fortinet/fortinet_single_sign-on < 6.4.6
Published Jul 12, 2021
Tracked Since Feb 18, 2026