Buffer overflow in D-Link Di-8400
CVE-2026-91001
A security flaw has been discovered in D-Link DI-8400 16.07. This affects the function ddns_asp of the file /ddns.asp of the component DDNS Configuration. Performing a manipulation of the argument serv/user/host/wild/mx/bmx/cust/ip results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (60.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- D-Link Di-8400 — versions 16.07
Weakness classification (CWE)
References
- vuldb.com/vuln/403582 (technical-description, vdb-entry)
- vuldb.com/vuln/403582/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-91001 (third-party-advisory)
- vuldb.com/submit/931642 (third-party-advisory)
- github.com/Vivi-Xray/Xray-s-cve-/tree/main/ddns_asp (related)
- github.com/Vivi-Xray/Xray-s-cve-/blob/main/ddns_asp/ddns_asp.py (exploit)
- www.dlink.com/ (product)
Frequently asked questions
- What is CVE-2026-91001?
- CVE-2026-91001 is a critical-severity vulnerability in D-Link Di-8400, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-09-15.
- How severe is CVE-2026-91001?
- Critical severity. CVSS v3 base score is 9.9 out of 10.