A improper neutralization of special elements used in an os command ('os command…
Priority MEDIUM 46CWE-78Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.
Summary
A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03323 88th 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
- Total
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* | 6.2.0 to before 6.2.7; 6.3.0 to before 6.3.16; 6.4.0 to before 6.4.2 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* Versions 6.2.0 to before 6.2.7; 6.3.0 to before 6.3.16; 6.4.0 to before 6.4.2 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41018
- 2026-10-03 Alias added: GHSA-78qc-3rq5-vcqr
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-2021-41018 · CVE Program
- CVE-2021-41018 · NVD
- FIRST EPSS
- GHSA-78qc-3rq5-vcqr · GitHub Advisory Database · CC BY 4.0
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