CVE-2021-38408
CRITICALCVSS 9.8/10EPSS 11.57%
Last modified
CVE-2021-38408 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of proper validation of the length of user-supplied data may allow remote code execution.. EPSS estimates a 11.57% chance of exploitation in the next 30 days.
Description
A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of proper validation of the length of user-supplied data may allow remote code execution.
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 |
|---|---|---|
| Advantech | Webaccess | <= 9.02 |
References
- https://us-cert.cisa.gov/ics/advisories/icsa-21-245-03Third Party Advisory, US Government Resource
- https://us-cert.cisa.gov/ics/advisories/icsa-21-245-03Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-38408?
A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused by a lack of proper validation of the length of user-supplied data may allow remote code execution.
How severe is CVE-2021-38408?
CVE-2021-38408 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 11.57% probability of exploitation in the next 30 days.
How do I fix CVE-2021-38408?
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.
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Are you affected by CVE-2021-38408?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST