CVE-2026-71407
Received Received - Intake

Stack-based Buffer Overflow in Fortinet FortiOS

Publication date: 2026-08-12

Last updated on: 2026-08-12

Assigner: Fortinet, Inc.

Description
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.

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Meta Information

Published
2026-08-12
Last Modified
2026-08-12
Generated
2026-08-12
AI Q&A
2026-08-12
EPSS Evaluated
N/A
NVD
CVE-2026-71407
EUVD
EUVD-2026-57191

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
fortinet fortios From 7.6.1 (inc) to 7.6.6 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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).

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Executive Summary

This is a stack-based buffer overflow vulnerability in Fortinet FortiOS versions 7.6.1 through 7.6.6. It allows an unauthenticated attacker to execute arbitrary code or commands through crafted sockets if the explicit proxy is configured with Kerberos authentication and SOCKS enabled. The attack requires bypassing stack protection and ASLR.

Impact Analysis

An attacker could exploit this to gain control over the affected system, potentially leading to data breaches, unauthorized access, or disruption of services. The impact depends on the system's configuration and network exposure.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection and security standards.

Mitigation Strategies

Upgrade FortiOS to a version that is not affected by this vulnerability. If upgrading is not immediately possible, disable the explicit proxy with Kerberos authentication and SOCKS enabled as a temporary workaround.

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