Fortinet FortiPAM/FortiProxy/FortiOS 7.6.1-7.6.6 WAD daemon stack-based overflow

Summaryinfo

A vulnerability classified as very critical has been found in Fortinet FortiPAM, FortiProxy and FortiOS 7.6.1-7.6.6. The impacted element is an unknown function of the component WAD daemon. Performing a manipulation results in stack-based overflow. This vulnerability is cataloged as CVE-2026-71407. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in Fortinet FortiPAM, FortiProxy and FortiOS 7.6.1-7.6.6. This affects some unknown processing of the component WAD daemon. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow an unauthenticated attacker who can bypass stack protection and ASLR to execute arbitrary code or commands in the context of the WAD daemon via crafted sockets, only if the explicit proxy is configured with Kerberos authentication and SOCKS enabled.

The advisory is shared at fortiguard.fortinet.com. This vulnerability is uniquely identified as CVE-2026-71407 since 08/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/12/2026).

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Fortinet

Name

• FortiOS
• FortiPAM
• FortiProxy

Version

• 7.6.1-7.6.6

License

• commercial

Website

• Vendor: https://www.fortinet.com/

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Entryinfo

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