CVE-2026-39811: Denial of service in Fortinet FortiWeb
CVE-2026-39811 is an integer overflow or wraparound vulnerability affecting multiple versions of Fortinet FortiWeb (7. 0. x through 8. 0. 3). This flaw may allow an attacker with high privileges to cause a denial of service condition. The vulnerability does not impact confidentiality or integrity but can disrupt availability. An official fix is available from the vendor to address this issue.
AI Analysis
Technical Summary
This vulnerability involves an integer overflow or wraparound in Fortinet FortiWeb versions 7.0.0 through 8.0.3. Exploitation requires high privileges and can result in denial of service by causing the system to crash or become unresponsive. The CVSS v3.1 base score is 4.4, indicating a medium severity level. The vendor has released an official fix to remediate the issue.
Potential Impact
Successful exploitation leads to denial of service, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet to remediate this vulnerability. Users should apply the vendor-provided patches for affected FortiWeb versions promptly to prevent denial of service conditions.
CVE-2026-39811: Denial of service in Fortinet FortiWeb
Description
CVE-2026-39811 is an integer overflow or wraparound vulnerability affecting multiple versions of Fortinet FortiWeb (7. 0. x through 8. 0. 3). This flaw may allow an attacker with high privileges to cause a denial of service condition. The vulnerability does not impact confidentiality or integrity but can disrupt availability. An official fix is available from the vendor to address this issue.
CVSS v3.1
Score 4.4medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer overflow or wraparound in Fortinet FortiWeb versions 7.0.0 through 8.0.3. Exploitation requires high privileges and can result in denial of service by causing the system to crash or become unresponsive. The CVSS v3.1 base score is 4.4, indicating a medium severity level. The vendor has released an official fix to remediate the issue.
Potential Impact
Successful exploitation leads to denial of service, impacting system availability. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet to remediate this vulnerability. Users should apply the vendor-provided patches for affected FortiWeb versions promptly to prevent denial of service conditions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- fortinet
- Date Reserved
- 2026-04-07T15:24:09.991Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
Threat ID: 69de650a82d89c981fbf090a
Added to database: 4/14/2026, 4:02:18 PM
Last enriched: 5/26/2026, 8:10:12 PM
Last updated: 5/28/2026, 8:00:39 AM
Views: 78
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