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>
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (22.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
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
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.