PatchTheCVECVE-2026-71407: A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 ma
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Routine
MEDIUM 5.6REMOTEUPGRADE
CVE-2026-71407 is a medium-severity flaw (CVSS 5.6) affecting fortios. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 57%) |
| CISA exploited list | No |
| Weakness | CWE-121 |
| Published | 2026-08-12 |
| Last modified | 2026-10-23 |
Publisher (CNA): Fortinet, Inc. · Vendor: fortinet
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
fortinet fortios UPGRADE
Affected: >= 7.6.1 and < 7.6.7
Fixed in: 7.6.7
Safe to downgrade to: a release before 7.6.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Exact fixes by distribution
Fedora 46 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source
sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-71408 MEDIUM 5.3 UPGRADE A allocation of resources without limits or throttling vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6,
- CVE-2024-21762 CRITICAL 9.8 EXPLOITED UPGRADE UPGRADE Fortinet FortiOS Out-of-Bound Write Vulnerability
- CVE-2025-61624 MEDIUM 6.0 EXPLOITED UPGRADE UPGRADE Fortinet Multiple Products Path Traversal Vulnerability
- CVE-2025-25249 HIGH 8.1 EXPLOITED UPGRADE UPGRADE Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability