Open redirect in Fortinet FortiWeb
Priority LOW 25CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-601.
Summary
A url redirection to untrusted site ('open redirect') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows attacker to use the device as proxy via crafted GET parameters in requests to error handlers
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00523 44th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Fortinet | Fortinet FortiWeb | FortiWeb 6.4.1, 6.4.0, 6.3.15, 6.3.14, 6.3.13, 6.3.12, 6.3.11, 6.3.10, 6.3.9, 6.3.8, 6.3.7, 6.3.6, 6.3.5, 6.3.4, 6.3.3, 6.3.2, 6.3.1, 6.3.0, 6.2.6, 6.2.5, 6.2.4, 6.2.3, 6.2.2, 6.2.1, 6.2.0, 6.1.2, 6.1.1, 6.1.0, 6.0.7, 6.0.6, 6.0.5, 6.0.4, 6.0.3, 6.0.2, 6.0.1, 6.0.0 | — | No fix listed | CNA |
- Fortinet FortiWeb VendorFortinet Affected FortiWeb 6.4.1, 6.4.0, 6.3.15, 6.3.14, 6.3.13, 6.3.12, 6.3.11, 6.3.10, 6.3.9, 6.3.8, 6.3.7, 6.3.6, 6.3.5, 6.3.4, 6.3.3, 6.3.2, 6.3.1, 6.3.0, 6.2.6, 6.2.5, 6.2.4, 6.2.3, 6.2.2, 6.2.1, 6.2.0, 6.1.2, 6.1.1, 6.1.0, 6.0.7, 6.0.6, 6.0.5, 6.0.4, 6.0.3, 6.0.2, 6.0.1, 6.0.0 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* | 6.0.0 – 6.0.7; 6.2.0 – 6.2.6; 6.3.0 – 6.3.15 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiweb:6.1.0:*:*:*:*:*:*:* | 6.1.0 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiweb:6.1.1:*:*:*:*:*:*:* | 6.1.1 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiweb:6.1.2:*:*:*:*:*:*:* | 6.1.2 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiweb:6.4.0:*:*:*:*:*:*:* | 6.4.0 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiweb:6.4.1:*:*:*:*:*:*:* | 6.4.1 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* Versions 6.0.0 – 6.0.7; 6.2.0 – 6.2.6; 6.3.0 – 6.3.15 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiweb:6.1.0:*:*:*:*:*:*:* Versions 6.1.0 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiweb:6.1.1:*:*:*:*:*:*:* Versions 6.1.1 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiweb:6.1.2:*:*:*:*:*:*:* Versions 6.1.2 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiweb:6.4.0:*:*:*:*:*:*:* Versions 6.4.0 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiweb:6.4.1:*:*:*:*:*:*:* Versions 6.4.1 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36191
- 2026-10-03 Alias added: GHSA-fpgv-9v95-hrgv
References
More Fortinet Fortiweb vulnerabilities
- TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-39856 Path traversal in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-18919 SQL injection in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.8
- TI-2025-35886 OS command injection in Fortinet FortiWeb KEVCVSS 3.1MEDIUM 6.7
- TI-2021-05113 OS command injection in Fortinet FortiWeb CVSS 3.1HIGH 8.8
- TI-2021-18960 Stack-based buffer overflow in Fortinet FortiWeb CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-36191 · CVE Program
- CVE-2021-36191 · NVD
- FIRST EPSS
- GHSA-fpgv-9v95-hrgv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences