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CVE-2021-26088

CriticalPublished

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...

Published: Jul 12, 2021
Updated: Oct 25, 2024
Assigning CNA: fortinet
Evidence observed: Aug 5, 2026

Primary CVSS

9.6/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 61.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2021-26088PoC
PoC for CVE-2021-26088 written in PowerShell

Responsible use

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