Out-of-bounds write in Fortinet FortiOS and FortiProxy
Priority CRITICAL 86Exploited in the wildCWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.
Why it matters now
Exploitation Active In CISA KEV since 2022-01-10CISA due date 2022-07-10Known ransomware use
EPSS 0.32473 98th 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
- Active
- 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 FortiOS and FortiProxy | FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier, FortiProxy 2.0.0, 1.2.8 and earlier | — | No fix listed | CNA |
- Fortinet FortiOS and FortiProxy VendorFortinet Affected FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier, FortiProxy 2.0.0, 1.2.8 and earlier Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* | before 1.2.9 | Vulnerable | Fortinet |
| cpe:2.3:a:fortinet:fortiproxy:2.0.0:*:*:*:*:*:*:* | 2.0.0 | Vulnerable | Fortinet |
| cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* | 5.2.0 to before 5.2.15; 5.4.0 to before 5.4.13; 5.6.0 to before 5.6.11; 6.0.0 to before 6.0.5 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* Versions before 1.2.9 Vulnerable ·Fortinet
- cpe:2.3:a:fortinet:fortiproxy:2.0.0:*:*:*:*:*:*:* Versions 2.0.0 Vulnerable ·Fortinet
- cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* Versions 5.2.0 to before 5.2.15; 5.4.0 to before 5.4.13; 5.6.0 to before 5.6.11; 6.0.0 to before 6.0.5 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2022-01-10 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2018-13383
- 2026-10-03 Alias added: GHSA-cjc8-2cq5-7jq7
References
More Fortinet Fortios vulnerabilities
- TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
- TI-2024-36904 Authentication bypass in Fortinet FortiOS KEVCVSS 3.1CRITICAL 9.8
- TI-2024-15234 A use of externally-controlled format string in Fortinet FortiOS versions 7.4.0 through… KEVCVSS 3.1CRITICAL 9.8
- TI-2024-14448 Out-of-bounds write in Fortinet FortiOS KEVCVSS 3.1CRITICAL 9.8
- TI-2023-12585 Heap-based buffer overflow in Fortinet FortiOS-6K7K KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2018-13383 · CVE Program
- CVE-2018-13383 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-cjc8-2cq5-7jq7 · 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