Fortinet FortiExtender up to 7.0.5/7.2.5/7.4.6/7.6.1 CLI buffer overflow

Summaryinfo

A vulnerability was found in Fortinet FortiExtender up to 7.0.5/7.2.5/7.4.6/7.6.1 and classified as critical. This affects an unknown part of the component CLI. Such manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2025-46776. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Fortinet FortiExtender up to 7.0.5/7.2.5/7.4.6/7.6.1. Affected by this issue is an unknown code of the component CLI. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at fortiguard.fortinet.com. This vulnerability is handled as CVE-2025-46776 since 04/29/2025. The exploitation is known to be difficult. The attack needs to be approached locally. The exploitation requires an enhanced level of successful authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/15/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Fortinet

Name

• FortiExtender

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.4.0
• 7.4.1
• 7.4.2
• 7.4.3
• 7.4.4
• 7.4.5
• 7.4.6
• 7.6.0
• 7.6.1

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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CPE 2.2info

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