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Vulnerabilities

Vulnerability · CVE-2026-71407

Stack buffer overflow in WAD

Published Aug 12, 2026 · catalog updated Oct 15, 2026 · Fortinet FortiOS

Check if you run it

No confirmed exploitation is on record for CVE-2026-71407. EPSS is 0.51%. Act only if a listed version of Fortinet FortiOS is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.51%
Remediation
Advisory link
Affected products
cpe fortinet/fortios · vendor Fortinet FortiOS · vendor Fortinet FortiPAM · vendor Fortinet FortiProxy

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fortinet/fortiosversion unspecified
  • vendor Fortinet FortiOSversion unspecified
  • vendor Fortinet FortiPAMversion unspecified
  • vendor Fortinet FortiProxyversion unspecified

How to fix CVE-2026-71407

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-71407. EPSS is 0.51%. Act only if a listed version of Fortinet FortiOS is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Fortinet security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 12, 2026 · NIST NVD

    Detected

    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.

  2. Oct 15, 2026 · NIST NVD

    Updated

    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.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-71407

    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, o

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-71407

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-71407

    30-day exploitation probability 0.5%

    first.org
  • Fortinet PSIRTVendor advisoryCVE-2026-71407

    CVE-2026-71407 is named in a Fortinet PSIRT advisory.

    filestore.fortinet.com
  • NIST NVDVulnerability recordCVE-2026-71407

    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, o

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.