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CVE-2026-90680— D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow

Quick assessment

Affected

D-Link DIR-823G

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

D-Link DIR-823G是中国D-Link公司的一款提供无线网络连接与多设备共享上网功能的家用无线路由器。 D-Link DIR-823G 1.0.2B05_20181207版本存在缓冲区错误漏洞，该漏洞源于HNAP1组件中文件/HNAP1/SetStaticRouteSettings的strcpy函数对参数PAddress/SubnetMask/Gateway处理不当，导致栈缓冲区溢出，攻击者可远程发起攻击。

CVSS 9.9 · Critical EPSS 0.91% · P60 Updated Sep 16, 2026

Possible ATT&CK Techniques 3 AI

T1190.002 T1190 · Exploit Public-Facing Application T1190.001

Affected Version Matrix 1

Vendor	Product	Version Range	Status
D-Link	DIR-823G	`1.0.2B05_20181207`	affected

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I. Basic Information for CVE-2026-90680

Vulnerability Information

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Vulnerability Title

D-Link DIR-823G HNAP1 SetStaticRouteSettings strcpy stack-based overflow

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

栈缓冲区溢出

Source: CVE Program / CVE List V5

Vulnerability Title

D-Link DIR-823G 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
D-Link	DIR-823G	1.0.2B05_20181207	`cpe:2.3:h:d-link:dir-823g::::::::`

II. Public POCs for CVE-2026-90680

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-90680

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Proof of Concept for CVE-2026-90680 (1)

🔗 router-vulnerability-research/advisories/d-link/dir-823g/SetStaticRouteSettings/README.md at main · Amalll-Sec/router-vulnerability-research · GitHub Read full article related

Vendor Pages for CVE-2026-90680 (1)

Smart Home, SMB and Enterprise solutions | D-Link product

https://www.cve.org/CVERecord?id=CVE-2026-90680

Same Patch Batch · D-Link · 2026-09-14 · 9 CVEs total

CVE-2026-90693	9.9 CRITICAL	D-Link DIR-878 WAN Settings SetWan3Settings stack-based overflow
CVE-2026-90692	9.9 CRITICAL	D-Link DIR-878 Dynamic DNS IPv6 Settings SetDynamicDNSIPv6Settings stack-based overflow
CVE-2026-90699	9.9 CRITICAL	D-Link DWR-M920 formPinManageSetup sub_41E60C os command injection
CVE-2026-90702	9.1 CRITICAL	D-Link DWR-M921 formDiskFormat system os command injection
CVE-2026-90703	9.1 CRITICAL	D-Link DWR-M921 formDiskCreateShare system os command injection
CVE-2026-90704	6.6 MEDIUM	D-Link DWR-M921 formDiskPartition system command injection
CVE-2026-90705	6.6 MEDIUM	D-Link DWR-M921 Boa Dispatch Table formsysCmd os command injection
CVE-2026-90706	6.6 MEDIUM	D-Link DWR-M921 formWsc os command injection

IV. Related Vulnerabilities

Same product: DIR-823G

Same vendor: D-Link

Same weakness: CWE-121