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CVE-2025-5622: Critical Buffer Overflow Vulnerability in D-Link DIR-816 1.10CNB05

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Overview

A critical vulnerability has been discovered in the D-Link DIR-816 1.10CNB05, a widely-used wireless router. The vulnerability lies in the wirelessApcli_5g function of the /goform/wirelessApcli_5g file and can be exploited remotely to cause a stack-based buffer overflow. This flaw presents a significant threat to the cybersecurity landscape, as it allows attackers to launch remote attacks leading to a possible system compromise or data leakage. Given that the exploit has been disclosed publicly and can readily be used, it is crucial for users and administrators to understand the severity of this issue and take appropriate mitigation steps.

Vulnerability Summary

CVE ID: CVE-2025-5622
Severity: Critical (CVSS 9.8)
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-816 | 1.10CNB05

How the Exploit Works

The exploit takes advantage of a stack-based buffer overflow vulnerability in the wirelessApcli_5g function of the /goform/wirelessApcli_5g file. By manipulating the argument apcli_mode_5g/apcli_enc_5g/apcli_default_key_5g, an attacker can overflow the buffer, potentially leading to arbitrary code execution or system crashes. This can further lead to system compromise or data leakage.

Conceptual Example Code

A conceptual example of how the vulnerability might be exploited is as follows:

POST /goform/wirelessApcli_5g HTTP/1.1
Host: target_router_IP
Content-Type: application/x-www-form-urlencoded
apcli_mode_5g=malicious_payload&apcli_enc_5g=malicious_payload&apcli_default_key_5g=malicious_payload

In the above example, `malicious_payload` represents a specially crafted string designed to overflow the buffer of the target device, thus exploiting the vulnerability.

Mitigation

Given that this vulnerability affects products that are no longer supported by the maintainer, users of the affected versions are advised to apply a vendor patch if available. If there are no patches available from the vendor, users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure to protect against potential exploits. It’s also advisable to replace unsupported devices with new, supported ones to ensure continued protection against cybersecurity threats.

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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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