Improper authentication in FortiOS - CVE-2021-26088
Published: July 14, 2021 / Updated: September 20, 2024
Vulnerability identifier: #VU54848
CSH Severity: Medium
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-26088
CWE-ID: CWE-287
Exploitation vector: Adjecent network
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in FSSO Collector when processing authentication requests. A remote attacker can send specifically crafted UDP login notification packets to bypass any firewall authentication rule and access the protected network.
The vulnerability affects both the FSSO DC Agent and Collector.
Affected software
FortiOS
How to mitigate CVE-2021-26088
Install updates from vendor's website.
FortiOS - addressed in versions 6.4.6, 7.0.1