A vulnerability has been discovered in D-Link DI-8003 16.07.26A1, which can lead to a buffer overflow when the s parameter in the pppoe_list_opt.asp endpoint is manipulated. By sending a crafted request with an excessively large value for the s parameter, an attacker can trigger a buffer overflow condition.
This vulnerability is classified as high severity with a CVSS score of 7.5. A high severity rating indicates that the vulnerability poses a significant risk to organizations using the affected product. As the attack vector is via the network, it is accessible remotely, making it more critical for organizations to take action.
Risk to organizations includes potential system unavailability due to the buffer overflow condition. The urgency for defenders is high, as exploitation could lead to major disruptions in service. Organizations should prioritize patching immediately.
As per available intelligence, there are currently no known exploits for this vulnerability, which means attackers have not yet publicly demonstrated a method to exploit it. However, the potential impact should not be underestimated.
Organizations should address this issue in priority patch cycles to ensure the integrity of their systems.
Vulnerability Details
The vulnerability affects D-Link DI-8003 firmware version 16.07.26A1. It is classified under CWE-120, which corresponds to 'Buffer Copy without Checking Size of Input'. This classification indicates that the vulnerability arises from inadequate validation of input sizes, allowing an attacker to exploit the buffer overflow.
The official CVSS vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, which indicates a network attack vector with low attack complexity and no required privileges or user interaction.
The vulnerability was published on April 8, 2026, and has since been modified. As a result, organizations using the affected firmware should be aware of this issue and take appropriate action.
Technical Analysis
The root cause of this vulnerability is the improper handling of the input parameter 's' in the pppoe_list_opt.asp endpoint. The ability for attackers to send excessively large values without sufficient validation leads to a buffer overflow.
The attack vector is network-based, which means that attackers can exploit this vulnerability remotely without needing physical access to the device. The attack complexity is low, indicating that the exploitation does not require advanced skills or resources.
No privileges are required for exploitation, and user interaction is not necessary. If an attacker successfully exploits this vulnerability, the availability of the system could be compromised, leading to potential downtime.
Risk & Impact Analysis
Organizations utilizing D-Link DI-8003 firmware are at risk of experiencing disruptions in service due to the buffer overflow vulnerability. The potential blast radius of this vulnerability is significant, as a successful exploit can lead to system unavailability, impacting both internal operations and customer satisfaction.
Given the high CVSS score of 7.5 and the exploitability rating being high, organizations should treat this vulnerability with urgency, prioritizing it in their patch management cycles. Regular vulnerability assessments and penetration testing can help identify such security gaps proactively.
The CVSS score indicates that the potential for exploitation is real, and organizations should be vigilant about monitoring their systems for any signs of unusual activity related to this vulnerability.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The only affected version is D-Link DI-8003 firmware version 16.07.26A1. Organizations using this firmware should take immediate action to secure their devices.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest firmware updates provided by D-Link. Ensure that you upgrade to a version that addresses this vulnerability. If a patch is unavailable, consider implementing network segmentation and strict access controls to limit exposure to this vulnerability.
Organizations should also consider engaging in penetration testing to validate the effectiveness of their security measures.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor system logs for unusual activity, particularly around the pppoe_list_opt.asp endpoint. Look for any attempts to send excessively large values to the s parameter.
Behavioral anomalies in network traffic patterns may also indicate attempts to exploit this vulnerability. Regular monitoring and analysis of network signatures can help in early detection.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its representation of common flaws in networked devices. The ability to manipulate input parameters leading to buffer overflow conditions is a pattern that security teams should be vigilant about.
Lessons for security teams include the importance of rigorous input validation and the need for comprehensive testing of network-facing services. This incident highlights the need for ongoing security assessments, including regular firmware updates and vulnerability scans.
For organizations looking to strengthen their security posture, integrating practices such as vulnerability management programs and proactive security testing can mitigate similar risks in the future.
For more insights on securing network devices, organizations can explore our resources on network security architecture and penetration testing methodology to enhance their defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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