CVE-2026-91001 D-Link DI-8400 - Buffer Overflow

D-Link DI-8400 16.07 contains a stack-based buffer overflow caused by manipulation of the serv/user/host/wild/mx/bmx/cust/ip arguments in /ddns.asp DDNS Configuration, letting remote attackers execute code, exploit requires crafted request.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.93% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-119

Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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