CVE-2021-36186
CRITICALCVSS 9.8/10EPSS 1.56%
Last modified
CVE-2021-36186 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack-based buffer overflow in Fortinet FortiWeb version 6.4.0, version 6.3.15 and below, 6.2.5 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests. EPSS estimates a 1.56% chance of exploitation in the next 30 days.
Description
A stack-based buffer overflow in Fortinet FortiWeb version 6.4.0, version 6.3.15 and below, 6.2.5 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fortinet | Fortiweb | >= 6.2.0, <= 6.2.5 |
| Fortinet | Fortiweb | >= 6.3.0, <= 6.3.15 |
| Fortinet | Fortiweb | 6.4.0 |
References
- https://fortiguard.com/advisory/FG-IR-21-119Vendor Advisory
- https://fortiguard.com/advisory/FG-IR-21-119Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36186?
A stack-based buffer overflow in Fortinet FortiWeb version 6.4.0, version 6.3.15 and below, 6.2.5 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests
How severe is CVE-2021-36186?
CVE-2021-36186 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36186?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-36186?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST