CVE-2026-90680: D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy 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: 2026-09-14 · updated 2026-09-16
Weakness: CWE-119

Description

A security flaw has been discovered in D-Link DIR-823G 1.0.2B05_20181207. The impacted element is the function strcpy of the file /HNAP1/SetStaticRouteSettings of the component HNAP1. The manipulation of the argument PAddress/SubnetMask/Gateway results in stack-based buffer overflow. The attack can be launched remotely.

Affected products

D-Link DIR-823G: 1.0.2B05_20181207

References

https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/d-link/dir-823g/SetStaticRouteSettings/README.md
https://vuldb.com/cve/CVE-2026-90680
https://vuldb.com/submit/914902
https://vuldb.com/vuln/403213
https://vuldb.com/vuln/403213/cti
https://www.dlink.com/

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