CVE-2026-39811
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
An integer overflow or wraparound vulnerability in Fortinet FortiWeb versions 8.0.0 through 8.0.3, 7.6.0 through 7.6.6, 7.4, 7.2, and 7.0 may allow an attacker to cause a denial of service.
Risk Assessment
This could lead to unavailability of the FortiWeb appliance and the applications it protects, disrupting business continuity.
Recommendation
Update FortiWeb to a patched version and monitor Fortinet security advisories.
Other vulnerabilities in Fortinet FortiWeb
See all- CVE-2016-4066High
CVE-2016-4066 is a CSRF vulnerability in Fortinet FortiWeb before version 5.5.3 that allows remote attackers to hijack the authentication of administrators for password change requests via unspecified vectors.
- CVE-2025-64446CriticalActively exploited
A relative path traversal vulnerability in Fortinet FortiWeb versions 8.0.0-8.0.1, 7.6.0-7.6.4, 7.4.0-7.4.9, 7.2.0-7.2.11, and 7.0.0-7.0.11 may allow an attacker to execute administrative commands via crafted HTTP or HTTPS requests.
- CVE-2023-23783Medium
Fortinet FortiWeb versions 7.0.0 through 7.0.1 and FortiWeb 6.4 all versions contain a use of externally-controlled format string vulnerability allowing an attacker to execute unauthorized code or commands via specially crafted command arguments.
Original NVD description (English source)
A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>
Vulnerability data from NVD (NIST) · CISA KEV · EPSS