Fortinet FortiOS/FortiPAM/FortiProxy HTTP Response response splitting

Summaryinfo

A vulnerability labeled as problematic has been found in Fortinet FortiOS, FortiPAM and FortiProxy. Affected is an unknown function of the component HTTP Response Handler. Executing a manipulation can lead to response splitting. This vulnerability appears as CVE-2025-62675. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Fortinet FortiOS, FortiPAM and FortiProxy (the affected version unknown). This vulnerability affects an unknown part of the component HTTP Response Handler. The manipulation with an unknown input leads to a response splitting vulnerability. The CWE definition for the vulnerability is CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. As an impact it is known to affect integrity. CVE summarizes:

An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an attacker in possession of a valid web filter override token to inject arbitrary headers via tricking a user into clicking on a crafted link.

The advisory is shared for download at fortiguard.fortinet.com. This vulnerability was named CVE-2025-62675 since 10/20/2025. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. 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 07/14/2026).

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiPAM
• FortiProxy

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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