Medium6.9Fortinet
stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 a…
CVE-2025-53843 Published Nov 18, 2025Updated by vendor Nov 21, 2025
Affected products & platforms
FortinetFortiGateFirewallFortiOS
Summary
A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets
Affected versions
- 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 all versions
- FortiOS 7.0: 7.0 all versions
- FortiOS 6.4: 6.4 all versions
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
- FortiOS 7.6: 7.6.4
- FortiOS 7.4: 7.4.9
- FortiOS 7.2: migrate to a fixed release
- FortiOS 7.0: migrate to a fixed release
- FortiOS 6.4: migrate to a fixed release
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.4; FortiOS 7.4: 7.4.9; FortiOS 7.2: migrate to a fixed release; FortiOS 7.0: migrate to a fixed release; FortiOS 6.4: migrate to a fixed release.
Temporary workarounds
- Warning :if auto-auth-extension-device is enable in config system interface, any devicecan be authorized and then the vulnerability can be exploited without administratorauthorization.Please note that auto-auth-extension-device is disabled by default
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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