CVE-2025-5622

Comprehensive Technical Analysis of CVE-2025-5622

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-5622 CVSS Score: 9.8 Severity: Critical

The vulnerability in question is a stack-based buffer overflow in the wirelessApcli_5g function of the /goform/wirelessApcli_5g file in D-Link DIR-816 1.10CNB05. This vulnerability allows an attacker to manipulate the arguments apcli_mode_5g, apcli_enc_5g, and apcli_default_key_5g, leading to a buffer overflow. The high CVSS score of 9.8 indicates that this vulnerability is extremely severe and poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited remotely, meaning an attacker does not need physical access to the device.
• Network-Based Attacks: Given that the vulnerability affects wireless settings, attackers could potentially exploit it over the network.

Exploitation Methods:

• Buffer Overflow: By sending specially crafted input to the wirelessApcli_5g function, an attacker can cause a buffer overflow.
• Code Execution: The buffer overflow can lead to arbitrary code execution, allowing the attacker to take control of the device.
• Denial of Service (DoS): The attacker could also cause the device to crash, leading to a denial of service.

3. Affected Systems and Software Versions

Affected Systems:

• D-Link DIR-816 1.10CNB05

Software Versions:

• The vulnerability specifically affects version 1.10CNB05 of the D-Link DIR-816 firmware.

Note: This vulnerability only affects products that are no longer supported by the maintainer, which increases the risk as there will be no official patches or updates to mitigate the issue.

4. Recommended Mitigation Strategies

Immediate Actions:

• Network Segmentation: Isolate affected devices on a separate network segment to limit potential attack vectors.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the device.
• Monitoring: Increase monitoring of network traffic to and from the affected devices to detect any suspicious activity.

Long-Term Actions:

• Upgrade Devices: Replace affected devices with supported models that receive regular security updates.
• Firmware Updates: Although the affected firmware version is no longer supported, check for any community-driven patches or updates.
• Security Best Practices: Implement strong password policies, disable unnecessary services, and regularly update all network devices.

5. Impact on Cybersecurity Landscape

Broader Implications:

• IoT Security: This vulnerability highlights the ongoing challenges in securing Internet of Things (IoT) devices, particularly those that are no longer supported by manufacturers.
• Supply Chain Risks: Organizations need to be aware of the risks associated with using outdated or unsupported hardware in their supply chain.
• Public Disclosure: The public disclosure of the exploit increases the risk of widespread attacks, making timely mitigation crucial.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: wirelessApcli_5g
• File: /goform/wirelessApcli_5g
• Arguments: apcli_mode_5g, apcli_enc_5g, apcli_default_key_5g

Exploit Availability:

• The exploit has been disclosed to the public and is available on GitHub. This increases the likelihood of attacks.

References:

• GitHub Exploit
• VulDB Entry
• D-Link Product Page

Conclusion: CVE-2025-5622 represents a critical vulnerability in D-Link DIR-816 1.10CNB05 that can be exploited remotely to cause stack-based buffer overflows. Given the lack of support for the affected firmware, immediate mitigation strategies such as network segmentation and increased monitoring are essential. Long-term, organizations should consider upgrading to supported devices and implementing robust security practices to mitigate similar risks in the future.