CVE-2021-26088

9.6 criticalEPSS 1.0%

Critical (9.6) in fortinet fortinet single sign-on. EPSS 1.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.6 critical

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

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2021-07-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

fortinet:fortinet_single_sign-on

References

https://fortiguard.com/advisory/FG-IR-20-191
https://fortiguard.com/advisory/FG-IR-20-191

Check your stack JSON