CVE-2026-91001: D-Link DI-8400 DDNS Configuration ddns.asp ddns_asp stack-based overflow

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-15 · updated 2026-09-15
Weakness: CWE-119

Description

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.

Affected products

D-Link DI-8400: 16.07

References

https://github.com/Vivi-Xray/Xray-s-cve-/blob/main/ddns_asp/ddns_asp.py
https://github.com/Vivi-Xray/Xray-s-cve-/tree/main/ddns_asp
https://vuldb.com/cve/CVE-2026-91001
https://vuldb.com/submit/931642
https://vuldb.com/vuln/403582
https://vuldb.com/vuln/403582/cti
https://www.dlink.com/

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