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Medium

Trusted Host Policy Bypass in FortiOS, FortiPAM, and FortiProxy

IdentifiersCVE-2025-54821CWE-269· Improper Privilege Management

CVE-2025-54821 is an improper privilege management vulnerability in Fortinet FortiOS, FortiPAM, and FortiProxy. According to the provided content, the flaw affects FortiOS 7.6.0 through 7.6.3, all versions of FortiOS 7.4, 7.2, 7.0, and 6.4; FortiPAM 1.6.0 and all versions of 1.5 through 1.0; and FortiProxy 7.6.0 through 7.6.3, and all versions of 7.4, 7.2, and 7.0. The vulnerability allows an authenticated administrator to bypass the trusted host policy by issuing a crafted CLI command. The specific vulnerable function or code path is not provided in the supplied material. The issue effectively weakens or circumvents administrative access controls intended to restrict management access to trusted source hosts.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an authenticated administrator to bypass the trusted host policy, undermining administrative source-based access restrictions. This can enable unauthorized management access paths from hosts that should not be permitted under the configured trusted host policy, reducing the effectiveness of administrative segmentation and access control. Based on the provided content, no direct code execution or privilege escalation beyond administrator-level access is described, but the flaw can facilitate unauthorized administrative operations from disallowed locations.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict and monitor administrative CLI access as tightly as possible, minimize the number of administrator accounts, enforce least privilege for administrative roles, and use compensating network controls to limit management-plane reachability to approved hosts and segments. Review trusted host configurations and administrative access logs for anomalous CLI activity. The provided content does not include an official vendor mitigation beyond upgrading.

Remediation

Patch, then assume compromise.

Upgrade affected FortiOS, FortiPAM, and FortiProxy installations to a Fortinet vendor-fixed release once available. The supplied content does not specify exact fixed versions, so the authoritative remediation is to apply Fortinet's published patches for CVE-2025-54821 and move to the latest supported release in the affected product branch.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
FortinetFortiosoperating_system
FortinetFortipamoperating_system
FortinetFortiproxyapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2025-54821
NVD
nvd.nist.gov/vuln/detail/CVE-2025-54821
MITRE CWE · CWE-269
Improper Privilege Management
Vendor Advisory
fortiguard.fortinet.com/psirt/FG-IR-25-545
cert-portal.siemens.com
cert-portal.siemens.com/productcert/html/ssa-864900.html