6.6

CVE-2026-59837: fortinet fortios Stack-based Buffer Overflow

CVSS: 6.6v3.1MediumModified
Published 14-07-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-59837 is a medium (CVSS 6.6) Stack-based Buffer Overflow vulnerability in fortinet fortios. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51.1% of scored vulnerabilities.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.6/10
010
Medium · v3.1 (NVD)
EPSS score
0.67%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2 all versions, FortiPAM 1.8.0 through 1.8.2, FortiPAM 1.7 all versions, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions may allow a privileged authenticated attacker who can bypass stack protection and ASLR to execute arbitrary code or commands via crafted HTTP requests.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.67%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

0.00 pp

From 0.67% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.67%

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

Fortinet4 products
  • fortios≥ 7.2.0, < 7.4.2 | ≥ 7.4.0, ≤ 7.4.1 | ≥ 7.2.0, ≤ 7.2.13 | ≥ 7.0.0, ≤ 7.0.19 | ≥ 6.4.0, ≤ 6.4.16
  • fortipam≥ 1.0.0, < 1.8.3 | ≥ 1.8.0, ≤ 1.8.2 | ≥ 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≥ 7.2.0, < 7.4.14 | ≥ 7.4.0, ≤ 7.4.13 | ≥ 7.2.0, ≤ 7.2.16
  • fortisase≥ 26.1.1, ≤ 26.1.2

1 vendor · 4 products

References

2 links