CVE-2025-15606 in TD-W8961N
Summary
by MITRE • 03/23/2026
A Denial-of-Service (DoS) vulnerability in the httpd component of TP-Link's TD-W8961N v4.0 due to improper input sanitization, allows crafted requests to trigger a processing error that causes the httpd service to crash. Successful exploitation may allow the attacker to cause service interruption, resulting in a DoS condition.
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Analysis
by VulDB Data Team • 03/31/2026
The vulnerability identified as CVE-2025-15606 represents a critical denial-of-service weakness within TP-Link's TD-W8961N router firmware version 4.0. This issue affects the httpd component which serves as the web-based management interface for the device, making it a prime target for attackers seeking to disrupt network operations. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing, creating an exploitable condition that can be leveraged to crash the device's web server service. The affected device operates a web interface that allows administrators to configure router settings through HTTP requests, and this particular flaw enables malicious actors to craft specific HTTP requests that will trigger an unhandled exception within the httpd service, leading to complete service disruption.
The technical implementation of this vulnerability falls under CWE-20, which specifically addresses improper input validation, and demonstrates how insufficient sanitization of user-provided data can lead to service disruption. When the httpd service receives a malformed or specially crafted HTTP request, it fails to properly validate the input parameters before attempting to process them, resulting in a crash of the web server daemon. This behavior aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through manipulation of network infrastructure devices. The vulnerability is particularly concerning because it requires no authentication to exploit, meaning any remote attacker can potentially disrupt service by simply sending malicious HTTP requests to the router's web interface. The crash occurs during the parsing or handling of the malformed input, causing the httpd process to terminate unexpectedly and forcing the router's web management interface to become unavailable.
From an operational perspective, this vulnerability presents a significant risk to network availability and business continuity, particularly in environments where uninterrupted access to router management is critical. The DoS condition affects not only the web-based management interface but can also potentially impact the overall network connectivity if the device becomes completely unresponsive. Network administrators who rely on remote access to configure or monitor their TP-Link TD-W8961N devices may find their ability to perform routine maintenance or troubleshooting operations severely compromised. The impact extends beyond simple service interruption as organizations may experience cascading effects when critical network infrastructure becomes unavailable, potentially affecting multiple users or systems depending on the network topology. The vulnerability's exploitation is straightforward and can be automated, making it particularly dangerous in environments with limited network monitoring or rapid response capabilities.
Mitigation strategies for CVE-2025-15606 should prioritize immediate firmware updates from TP-Link, as this represents the most effective long-term solution to address the root cause of the vulnerability. Organizations should implement network segmentation to isolate critical infrastructure devices and reduce the potential impact of such attacks. Network monitoring solutions should be configured to detect unusual traffic patterns or service disruptions that might indicate exploitation attempts, particularly focusing on HTTP traffic directed toward affected router interfaces. Access control measures including firewall rules that restrict access to the router's web management interface to trusted IP addresses can provide additional protection layers. Network administrators should also consider implementing intrusion detection systems that can identify and alert on known malicious patterns associated with this vulnerability. Regular vulnerability assessments and network audits should be conducted to identify other potentially affected devices within the network infrastructure, as similar issues may exist in other TP-Link firmware versions or network equipment. The remediation process should include comprehensive testing of updated firmware in controlled environments before deployment to production networks to ensure that the patch does not introduce compatibility issues or unintended side effects.