Buffer overflow in D-link Di-8400
CVE-2025-9938
A weakness has been identified in D-Link DI-8400 16.07.26A1. The affected element is the function yyxz_dlink_asp of the file /yyxz.asp. This manipulation of the argument ID causes stack-based buffer overflow. It is possible to initiate the…
Vulnerability class: Buffer Overflow
EPSS: 0.004 (62.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.
Affected products
- D-link Di-8400 — versions 16.07.26A1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- VDB-322340 | D-Link DI-8400 yyxz.asp yyxz_dlink_asp stack-based overflow (vdb-entry, technical-description)
- VDB-322340 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #643446 | D-Link DI-8400 16.07.26A1 Stack-based Buffer Overflow (third-party-advisory)
- github.com/ZZ2266/.github.io/tree/main/Dlink/DI-8400/yyxz.asp (related)
- github.com/ZZ2266/.github.io/tree/main/Dlink/DI-8400/yyxz.asp (exploit)
- www.dlink.com/ (product)
Frequently asked questions
- What is CVE-2025-9938?
- CVE-2025-9938 is a high-severity vulnerability in D-link Di-8400, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2025-09-03.
- How severe is CVE-2025-9938?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-9938 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.