CVE-2026-90680 D-Link DIR-823G - Buffer Overflow

D-Link DIR-823G 1.0.2B05_20181207 contains a stack-based buffer overflow caused by improper handling of PAddress/SubnetMask/Gateway arguments in /HNAP1/SetStaticRouteSettings, 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
0.91% 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
14 September 2026
Updated
15 October 2026
Weakness
CWE-119

Vendor fix

Update to the latest firmware 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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