FortiOS
CVE-2025-53847: Missing authentication for critical function in FortiOS
A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiOS 6.2.9 through 6.2.17 allows attacker to execute unauthorized code or commands via specially crafted packets.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| FortiOS 7.6.0 to 7.6.3 | 7.6.4 or later |
| FortiOS 7.4.0 to 7.4.8 | 7.4.9 or later |
| FortiOS 7.2.0 to 7.2.11 | 7.2.12 or later |
| FortiOS 7.0.0 to 7.0.17 | 7.0.18 or later |
| FortiOS 6.4.0 to 6.4.16 | Upgrade past 6.4.16; see the advisory |
| FortiOS 6.2.9 to 6.2.17 | Upgrade past 6.2.17; see the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiOS 6.2.9 through 6.2.17 allows attacker to execute unauthorized code or commands via specially crafted packets.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.