Vulnerability in Fortinet Fortios
CVE-2026-59840
A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to information disclosure via <insert attack vector here>
EPSS: 0.003 (23.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Fortinet Fortios — versions 7.6.0, 7.4.0, 7.2.0
- Fortinet Fortipam — versions 1.7.0, 1.6.0, 1.5.0
- Fortinet Fortiproxy — versions 7.6.0, 7.4.0, 7.2.0
- Fortinet Fortiswitchmanager — versions 7.2.0, 7.0.0
Weakness classification (CWE)
References
- psirt@fortinet.com (Vendor Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2026-59840?
- CVE-2026-59840 is a medium-severity vulnerability in Fortinet Fortios, classified under Buffer Over-read. CVSS score: 4.3/10. Published 2026-07-14.
- How severe is CVE-2026-59840?
- Medium severity. CVSS v3 base score is 4.3 out of 10.