Medium severity · published Jul 14, 2026
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…
6.6
CVSS
0.7%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FortiOS · Fortinet
7.4.0 through 7.4.1; 7.2.0 through 7.2.13; 7.0.0 through 7.0.19; 6.4.0 through 6.4.16 · source: vendor, NVD
FO
FortiPAM · Fortinet
1.8.0 through 1.8.2; 1.7.0 through 1.7.2; 1.6.0 through 1.6.2; 1.5.0 through 1.5.1; 1.4.0 through 1.4.3; 1.3.0 through 1.3.1; +3 more · source: vendor, NVD
FO
FortiProxy · Fortinet
7.4.0 through 7.4.13; 7.2.0 through 7.2.16 · source: vendor, NVD
FO
FortiSASE · Fortinet
26.1.1 through 26.1.2 · source: vendor
RA
RUGGEDCOM APE1808 · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59837
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59837
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-26-148
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-864900.html
More from FortiOS
9.8
CVE-2026-24858
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
9.8
CVE-2025-25249
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
9.8
CVE-2025-59718
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
9.8
CVE-2024-55591
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
9.8
CVE-2024-23113
Fortinet Multiple Products Format String Vulnerability