A vulnerability has been found in TOTOLINK WA1200 5.9c.2914. The impacted element is an unknown function of the file cstecgi.cgi of the component HTTP Request Handler. The manipulation leads to null pointer dereference. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.
This vulnerability has a CVSS score of 5.5, indicating a medium severity level. Organizations should understand the potential risks associated with this vulnerability and prioritize remediation actions.
Risk to organizations includes potential unauthorized access and disruption of services, which could lead to further exploitation if not mitigated in a timely manner.
Organizations should prioritize patching immediately.
Vulnerability Details
A vulnerability has been found in TOTOLINK WA1200 5.9c.2914, affecting the file cstecgi.cgi within the HTTP Request Handler component. This vulnerability can be exploited by causing a null pointer dereference. The CVSS version 4.0 vector for this vulnerability is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.
The CVSS score is 5.5, classified as medium severity, which indicates it poses a moderate risk. The attack vector is network-based, and the attack complexity is low, meaning that no special conditions are required for exploitation.
The affected product is the TOTOLINK WA1200, specifically version 5.9c.2914. This vulnerability was published on January 8, 2026.
Technical Analysis
The root cause of this vulnerability is the improper handling of null pointers within the cstecgi.cgi script. This can lead to a denial of service condition where the device may become unresponsive.
The attack vector is network-based, allowing attackers to exploit the vulnerability remotely without requiring physical access to the device. The attack complexity is low, with no special privileges or user interaction needed to successfully exploit the vulnerability.
The availability impact is low, meaning that while the device may become unresponsive, the integrity and confidentiality remain unaffected.
Risk & Impact Analysis
Real-world deployment of the TOTOLINK WA1200 that is exposed to the internet is at significant risk. Attackers may leverage this vulnerability to disrupt services or create potential backdoors for further exploitation.
Organizations should assess their exposure and prioritize this vulnerability according to their risk management protocols. The blast radius potential is moderate, primarily affecting devices that remain unpatched.
Given the CVSS score and the lack of known exploits, organizations are advised to address this vulnerability in their priority patch cycle.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include the TOTOLINK WA1200, specifically the firmware version 5.9c.2914. Organizations using earlier versions should prioritize upgrading to the patched release as soon as it is available.
Mitigation & Remediation
As a mitigation strategy, organizations should monitor for patches or updates from TOTOLINK. If a patch is unavailable, implementing network segmentation to limit access to the affected devices can reduce the risk of exploitation.
Organizations are encouraged to validate remediation through penetration testing to ensure that similar vulnerabilities do not exist.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual HTTP requests targeting the cstecgi.cgi file. Behavioral anomalies in network traffic that suggest attempts to dereference null pointers should also be flagged.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its demonstration of the risks associated with remote exploitation of network devices. It highlights the necessity for organizations to adopt proactive security measures.
Security teams should learn from this incident to enhance their threat modeling processes and prioritize vulnerabilities based on their potential impact. For further insights, organizations can refer to our vulnerability management program. Additionally, understanding the importance of continuous security assessments, such as penetration testing methodology, can strengthen defenses against emerging threats.
Ultimately, organizations must remain vigilant and responsive to vulnerabilities that could compromise their network security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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