CVE-2026-71407

publishedCWE-121

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.

Technical severity5.1 mediumCVSS 3.1 · CNA: fortinet

Published2026-08-12Source updated 2026-11-10

Collected2026-11-103 attributed sources

Fixes and workarounds

Fix

Upgrade to FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.7 or above

Source: CNA: fortinet

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
FortiOS Fortinet	≥ 7.6.1; ≤ 7.6.6 (affected, semver) Other versions: unaffected	CNA: fortinet
RUGGEDCOM APE1808 Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "7.6.7",
            "versionStartIncluding": "7.6.1",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 5.1 medium	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C`	CNA: fortinet
3.1 / 8.1 high	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`	NVD: [email protected]
3.1 / 5.6 medium	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-161CNA: fortinet
https://cert-portal.siemens.com/productcert/html/ssa-127084.htmlADP: siemens-SADP
https://fortiguard.fortinet.com/psirt/FG-IR-26-161[email protected] · Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-127084.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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