High [CVE-2025-53844] Out-of-bounds access in CAPWAP daemon
This high-severity Fortinet advisory covers CVE-2025-53844 affecting FortiOS.
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Summary
CVSSv3 Score:
8.3
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
Revised on 2026-05-12 00:00:00
- FortiOS 7.6: 7.6.0 through 7.6.3
- FortiOS 7.4: 7.4.0 through 7.4.8
- FortiOS 7.2: 7.2.0 through 7.2.11
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- FortiOS 7.6: 7.6.4
- FortiOS 7.4: 7.4.9
- FortiOS 7.2: 7.2.12
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.4; FortiOS 7.4: 7.4.9; FortiOS 7.2: 7.2.12.
- **Post-Change Configuration Validation**
- show full | grep wireless-controllerset wireless-controller disableset wireless-controller-port 5246
- show full | grep fortiextenderset fortiextender disableset fortiextender-data-port 25246set fortiextender-discovery-lockdown disableset fortiextender-provision-on-authorization disableset fortiextender-vlan-mode disable```
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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