Buffer overflow in Fortinet Fortios
CVE-2026-59837
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Fortinet Fortios — versions 7.4.0, 7.2.0, 7.0.0
- Fortinet Fortipam — versions 1.8.0, 1.7.0, 1.6.0
- Fortinet Fortiproxy — versions 7.4.0, 7.2.0
- Fortinet Fortisase — versions 26.1.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-59837?
- CVE-2026-59837 is a medium-severity vulnerability in Fortinet Fortios, classified under Stack-based Buffer Overflow. CVSS score: 6.6/10. Published 2026-07-14.
- How severe is CVE-2026-59837?
- Medium severity. CVSS v3 base score is 6.6 out of 10.