CVE-2026-124560
Deferred Deferred - Pending Action

Heap-based Buffer Overflow in D-Link DIR-878 Router

Vulnerability report for CVE-2026-124560, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: VulDB

Description

A vulnerability was found in D-Link DIR-878 1.20B05. This affects the function GetCAPTCHAsetting of the file bin/prog.cgi of the component HNAP Handler. Performing a manipulation of the argument uid results in heap-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. This vulnerability only affects products that are no longer supported by the maintainer.

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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
d-link dir-878 1.20b05

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

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Executive Summary

This vulnerability is a heap-based buffer overflow in D-Link DIR-878 version 1.20B05. It occurs in the GetCAPTCHAsetting function of the bin/prog.cgi file within the HNAP Handler component. The flaw is triggered by manipulating the uid argument, leading to memory corruption. The issue is remotely exploitable and has a public exploit available. The product is no longer supported by the vendor.

Impact Analysis

An attacker could exploit this to execute arbitrary code on the device, potentially gaining full control. This may allow network compromise, data theft, or disruption of network services. Since the device is unsupported, no patches will be available to fix this issue.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using this device may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

Mitigation Strategies

Since D-Link DIR-878 1.20B05 is no longer supported by the maintainer, the best immediate step is to replace the device with a supported model. If replacement is not possible, isolate the device from the network to prevent remote exploitation.

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