8.1

CVE-2026-71407: fortinet fortios Stack-based Buffer Overflow

CVSS: 8.1v3.1HighModified
Published 12-08-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-71407 is a high (CVSS 8.1) Stack-based Buffer Overflow vulnerability in fortinet fortios. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.8% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.51%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

-0.03 pp

From 0.54% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet3 products
  • fortios≥ 7.6.1, ≤ 7.6.6 | ≥ 7.6.1, < 7.6.7
  • fortipam≥ 1.8.0, ≤ 1.8.4 | ≥ 1.7.0, ≤ 1.7.2 | ≥ 1.6.0, ≤ 1.6.2 | ≥ 1.5.0, ≤ 1.5.1 | ≥ 1.4.0, ≤ 1.4.3 | ≥ 1.3.0, ≤ 1.3.1 | 1.2.0 | ≥ 1.1.0, ≤ 1.1.2 | ≥ 1.0.0, ≤ 1.0.3
  • fortiproxy≥ 7.6.0, ≤ 7.6.4 | ≥ 7.4.0, ≤ 7.4.11 | ≥ 7.2.0, ≤ 7.2.16 | ≥ 7.0.0, ≤ 7.0.23

1 vendor · 3 products

References

2 links