Fortinet FortiOS/FortiProxy Administrative Interface buffer underflow

Summaryinfo

A vulnerability described as very critical has been identified in Fortinet FortiOS and FortiProxy. This issue affects some unknown processing of the component Administrative Interface. The manipulation results in buffer underflow. This vulnerability is cataloged as CVE-2023-25610. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Fortinet FortiOS and FortiProxy (Firewall Software) (unknown version). It has been classified as very critical. Affected is an unknown code block of the component Administrative Interface. The manipulation with an unknown input leads to a buffer underflow vulnerability. CWE is classifying the issue as CWE-124. The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version 7.2.0 through 7.2.3, version 7.0.0 through 7.0.6, version 6.4.0 through 6.4.11 and version 6.2.12 and below, FortiProxy version 7.2.0 through 7.2.2, version 7.0.0 through 7.0.8, version 2.0.12 and below and FortiOS-6K7K version 7.0.5, version 6.4.0 through 6.4.10 and version 6.2.0 through 6.2.10 and below allows a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.

The weakness was shared 03/12/2023 as FG-IR-23-001. The advisory is shared for download at fortiguard.com. This vulnerability is traded as CVE-2023-25610 since 02/08/2023. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/25/2025).

As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 209852 (Fortinet FortiWeb Heap buffer underflow in administrative interface (FG-IR-23-001)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (209852). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiProxy

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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Submitinfo

Accepted

• Submit #100691: FortiOS / FortiProxy - Heap buffer underflow in administrative interface (by fortiguard.com)

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

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