CVE-2026-90680
Received Received - Intake

Stack-Based Buffer Overflow in D-Link DIR-823G Router

Vulnerability report for CVE-2026-90680, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: VulDB

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.

CVSS Scores

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
d-link dir-823g 1.0.2b05_20181207

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

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Executive Summary

CVE-2026-90680 is a stack-based buffer overflow vulnerability in D-Link DIR-823G routers. It occurs in the HNAP1 SetStaticRouteSettings handler due to the use of unsafe strcpy operations that copy attacker-controlled XML values (IPAddress, SubnetMask, Gateway) into fixed-size 32-byte stack buffers without length validation. This can lead to memory corruption and crash the device's web management process.

Detection Guidance

To detect this vulnerability, scan for D-Link DIR-823G devices with firmware version V1.0.2B05_20181207. Check for unusual crashes in the web management process or unexpected behavior when handling static route settings. Use network scanners like Nmap to identify vulnerable devices by querying the HNAP1 SetStaticRouteSettings endpoint.

Impact Analysis

This vulnerability allows remote attackers to crash the router's web management process by sending oversized XML fields. This could disrupt network services, prevent device management, and potentially enable further attacks if combined with other exploits.

Mitigation Strategies

Immediately update the D-Link DIR-823G firmware to the latest version. Disable remote management access to the router if not required. Block external access to the HNAP1 SetStaticRouteSettings endpoint using firewall rules. Monitor device logs for signs of exploitation attempts.

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