CVE-2025-46776: fortiextender Buffer Overflow — Fix

Description

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allow an authenticated user to execute arbitrary code or commands via crafted CLI commands.

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CVSS v3.1 Score

6.4

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-120 CWE-120

Affected Products

Vendor	Product	Versions
fortinet	fortiextender_firmware	7.0.0 — 7.4.8
fortinet	fortiextender_firmware	7.6.0 — 7.6.3
fortinet	fortiextender	All

References

Advisories & Patches

https://fortiguard.fortinet.com/psirt/FG-IR-25-251

Frequently Asked Questions

What is CVE-2025-46776? +

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiExtender 7.6.0 through 7.6.1, FortiExtender 7.4.0 through 7.4.6, FortiExtender 7.2 all versions, FortiExtender 7.0 all versions may allow an authenticated user to execute arbitrary code or commands via crafted CLI commands. It has a CVSS v3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2025-46776? +

CVE-2025-46776 has a CVSS v3.1 score of 6.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-46776? +

CVE-2025-46776 affects products from fortinet, specifically: fortiextender, fortiextender_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46776? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-46776