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CVE-2025-55599: Critical Buffer Overflow Vulnerability in D-Link DIR-619L 2.06B01

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Overview

A critical vulnerability, CVE-2025-55599, has been discovered in D-Link DIR-619L 2.06B01, potentially affecting thousands of users globally. This vulnerability, if exploited, could lead to system compromise and data leakage. Given the widespread use of D-Link routers, this vulnerability could have significant implications for both individual and corporate users.

Vulnerability Summary

CVE ID: CVE-2025-55599
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

D-Link DIR-619L | 2.06B01

How the Exploit Works

The vulnerability exists due to a buffer overflow in the formWlanSetup function within the D-Link DIR-619L 2.06B01 system. The parameter responsible for this is ‘f_wds_wepKey’. If an attacker sends a specially crafted request to this function with an overly long value for this parameter, it can cause a buffer overflow, leading to potential system compromise and data leakage.

Conceptual Example Code

Below is a conceptual representation of how the vulnerability might be exploited:

POST /formWlanSetup HTTP/1.1
Host: vulnerable-router.example.com
Content-Type: application/x-www-form-urlencoded
f_wds_wepKey=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... [continue until buffer overflow is triggered]

In the above example, the `f_wds_wepKey` parameter is filled with an excessively long string of “A”s, which can potentially trigger a buffer overflow in the target system.

Mitigation Guidance

Users are recommended to apply the latest patch provided by D-Link for this vulnerability as soon as possible. In the interim, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure against potential exploits targeting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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