Description
Under non-default configuration, a stack-based buffer overflow in FortiOS version 6.0.10 and below, version 5.6.12 and below may allow a remote attacker authenticated to the SSL VPN to crash the FortiClient NAC daemon (fcnacd) and potentially execute arbitrary code via requesting a large FortiClient file name. We are not aware of proof of concept code successfully achieving the latter.
References (1)
Core 1
Core References
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-20-083
Scores
CVSS v3
5.4
EPSS
0.0404
EPSS Percentile
88.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-121
CWE-787
Status
published
Products (1)
fortinet/fortios
< 5.6.13
Published
Dec 19, 2024
Tracked Since
Feb 18, 2026