CVE-2026-39811
Received
Received - Intake
Integer Overflow in Fortinet FortiWeb Causes Denial of Service
Publication date: 2026-04-14
Last updated on: 2026-04-21
Assigner: Fortinet, Inc.
Description
Description
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>
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| fortinet | fortiweb | From 7.6.0 (inc) to 7.6.7 (exc) |
| fortinet | fortiweb | From 8.0.0 (inc) to 8.0.4 (exc) |
| fortinet | fortiweb | From 7.0.0 (inc) to 7.0.13 (inc) |
| fortinet | fortiweb | From 7.2.0 (inc) to 7.2.13 (inc) |
| fortinet | fortiweb | From 7.4.0 (inc) to 7.4.12 (inc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-190 | The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an integer overflow or wraparound issue found in multiple versions of Fortinet FortiWeb (versions 7.0 all versions through 8.0.3). An attacker may exploit this flaw to cause a denial of service (DoS) condition.
How can this vulnerability impact me? :
The primary impact of this vulnerability is that an attacker could cause a denial of service, potentially disrupting the availability of the affected FortiWeb systems.
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