CVE-2021-38408
A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-38408- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-121
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-38408- Weakness
- CWE-121
- Updated
- 2026-11-02
EUVDEUVD-2021-24860 No score
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.
- Record
EUVD-2021-24860- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-pc3j-ph7x-cxh4 No score
A stack-based buffer overflow vulnerability in Advantech WebAccess Versions 9.02 and prior caused...
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.
- Record
GHSA-pc3j-ph7x-cxh4- Weakness
- CWE-121
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-38408 is a critical vulnerability (CVSS 9.8) in Advantech Webaccess, published September 9, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 11.6%, the 96th percentile. No source names a fixed version.