CVE-2026-90692
Received Received - Intake

Stack-Based Buffer Overflow in D-Link DIR-878 Router Firmware

Vulnerability report for CVE-2026-90692, 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 vulnerability was detected in D-Link DIR-878 120B05. This affects the function SetDynamicDNSIPv6Settings of the component Dynamic DNS IPv6 Settings. The manipulation of the argument IPv6Address/Hostname results in stack-based buffer overflow. The attack may be launched remotely.

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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-878 120b05

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

This vulnerability is a stack-based buffer overflow in the D-Link DIR-878 router's SetDynamicDNSIPv6Settings function. It occurs when attacker-controlled values for IPv6Address and Hostname are copied into fixed-size stack buffers without proper length validation using unsafe sprintf operations. This can corrupt stack memory and crash the web management process.

Detection Guidance

To detect this vulnerability, check if your D-Link DIR-878 router is running firmware version FW120B05_decode. You can log in to the router's admin panel and verify the firmware version in the system settings. Additionally, monitor for crashes in the web management process, which may indicate exploitation attempts.

Impact Analysis

This vulnerability allows remote attackers to execute arbitrary code or crash the router's web management interface by sending maliciously crafted input. This could lead to loss of device functionality, unauthorized access, or potential further network compromise if exploited.

Mitigation Strategies

Immediately update the router's firmware to the latest version provided by D-Link. If no update is available, disable remote management access and restrict access to the router's admin panel to trusted networks only. Consider replacing the device if no patch is issued.

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