Description
A flaw has been found in Wavlink NU516U1 251208. This affects the function sub_401A10 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to out-of-bounds write. The attack may be performed from remote. The exploit has been published and may be used. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2026-10211
1. Vulnerability Assessment and Severity Evaluation
Vulnerability Description:
The vulnerability in question affects the Wavlink NU516U1 device, specifically in the function sub_401A10 of the file /cgi-bin/login.cgi. The flaw allows for an out-of-bounds write by manipulating the ipaddr argument. This vulnerability can be exploited remotely, making it particularly dangerous.
Severity Evaluation:
The CVSS (Common Vulnerability Scoring System) base score of 9.3 indicates a critical vulnerability. The vector string CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P breaks down as follows:
- AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
- AC:L (Attack Complexity: Low) - The attack requires low complexity.
- AT:N (Attack Technique: Network) - The attack technique is network-based.
- PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
- UI:N (User Interaction: None) - No user interaction is required.
- VC:H (Vulnerability Confidentiality: High) - The vulnerability has a high impact on confidentiality.
- VI:H (Vulnerability Integrity: High) - The vulnerability has a high impact on integrity.
- VA:H (Vulnerability Availability: High) - The vulnerability has a high impact on availability.
- SC:N (Scope Change: None) - The scope does not change.
- SI:N (Scope Integrity: None) - The scope integrity is not affected.
- SA:N (Scope Availability: None) - The scope availability is not affected.
- E:P (Exploit Code Maturity: Proof-of-Concept) - Proof-of-concept code is available.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Exploitation: An attacker can exploit this vulnerability over the network without needing physical access to the device.
- Manipulation of
ipaddrArgument: By crafting a malicious input for theipaddrargument, an attacker can trigger an out-of-bounds write, leading to potential code execution or denial of service.
Exploitation Methods:
- Buffer Overflow: The out-of-bounds write can be used to overwrite critical memory areas, potentially leading to arbitrary code execution.
- Denial of Service (DoS): The vulnerability can be exploited to crash the device, causing a denial of service.
3. Affected Systems and Software Versions
Affected Systems:
- Wavlink NU516U1 device
Software Versions:
- Firmware version 251208
4. Recommended Mitigation Strategies
Immediate Actions:
- Upgrade Firmware: Users should immediately upgrade to the latest firmware version provided by Wavlink. The fixed version can be downloaded from Wavlink's official site.
- Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
- Monitoring: Implement network monitoring to detect unusual traffic patterns that may indicate an exploitation attempt.
Long-Term Strategies:
- Regular Patching: Ensure that all devices are regularly updated with the latest security patches.
- Security Audits: Conduct regular security audits to identify and mitigate potential vulnerabilities.
- Intrusion Detection Systems (IDS): Deploy IDS to detect and respond to suspicious activities.
5. Impact on European Cybersecurity Landscape
Impact Analysis:
- Widespread Deployment: Given the widespread use of Wavlink devices, this vulnerability poses a significant risk to European organizations and individuals.
- Critical Infrastructure: If deployed in critical infrastructure, the vulnerability could lead to severe disruptions.
- Regulatory Compliance: Organizations must ensure compliance with EU regulations such as GDPR and NIS Directive, which mandate robust cybersecurity measures.
6. Technical Details for Security Professionals
Technical Analysis:
- Vulnerable Function:
sub_401A10in/cgi-bin/login.cgi - Exploit Details: The vulnerability can be triggered by manipulating the
ipaddrargument, leading to an out-of-bounds write. - Proof-of-Concept: A proof-of-concept exploit is available on GitHub.
References:
Conclusion: The vulnerability in Wavlink NU516U1 is critical and requires immediate attention. Organizations should prioritize firmware upgrades and implement robust security measures to mitigate the risk. The availability of a proof-of-concept exploit underscores the urgency of addressing this issue to protect against potential attacks.