PSIRTOut-of-bounds access in CAPWAP daemon
Summary
An Out-Of-Bounds Write vulnerability [CWE-787] in FortiOS capwap daemon may allow an attacker controlling an authenticated FortiAP FortiExtender or FortiSwitch to gain execution privileges on the FortiGate device
| Version | Affected | Solution |
|---|---|---|
| FortiOS 7.6 | 7.6.0 through 7.6.3 | Upgrade to 7.6.4 or above |
| FortiOS 7.4 | 7.4.0 through 7.4.8 | Upgrade to 7.4.9 or above |
| FortiOS 7.2 | 7.2.0 through 7.2.11 | Upgrade to 7.2.12 or above |
Workarounds : Disable capwap daemon :
```config global
config system global
set wireless-controller disable
end
**Post-Change Configuration Validation**
show full | grep wireless-controller
set wireless-controller disable
set wireless-controller-port 5246
show full | grep fortiextender
set fortiextender disable
set fortiextender-data-port 25246
set fortiextender-discovery-lockdown disable
set fortiextender-provision-on-authorization disable
set fortiextender-vlan-mode disable
```
Acknowledgement
Internally discovered and reported by Gwendal Guégniaud of Fortinet Product Security team.Timeline
2026-05-12: Initial publication