CVE-2020-35832 in D7800
Summary
by MITRE • 12/30/2020
Certain NETGEAR devices are affected by stored XSS. This affects D7800 before 1.0.1.56, R7500v2 before 1.0.3.46, R7800 before 1.0.2.68, R8900 before 1.0.4.28, R9000 before 1.0.4.28, RAX120 before 1.0.0.78, RBK20 before 2.3.5.26, RBR20 before 2.3.5.26, RBS20 before 2.3.5.26, RBK40 before 2.3.5.30, RBR40 before 2.3.5.30, RBS40 before 2.3.5.30, RBK50 before 2.3.5.30, RBR50 before 2.3.5.30, RBS50 before 2.3.5.30, XR500 before 2.3.2.56, and XR700 before 1.0.1.10.
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Analysis
by VulDB Data Team • 05/21/2026
This vulnerability represents a stored cross-site scripting flaw that affects multiple NETGEAR router models across various product lines including the D7800, R7500v2, R7800, R8900, R9000, RAX120, and numerous RBK, RBR, RBS, and XR series devices. The vulnerability exists in the web interface handling of user input parameters, allowing attackers to inject malicious scripts that persist in the device's memory and execute whenever the affected pages are accessed. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is incorporated into web pages without proper validation or sanitization. The affected firmware versions indicate that this is a widespread issue affecting devices from different generations and product categories within NETGEAR's portfolio, suggesting a systemic flaw in the input handling mechanisms across multiple firmware versions.
The technical exploitation of this stored XSS vulnerability occurs when an attacker crafts malicious input through web forms or parameters within the device management interface and submits it to the router. The vulnerable device fails to properly sanitize this input before storing it in its configuration or user data structures, allowing the malicious script to be executed in the context of any user session accessing the affected web interface. This creates a persistent threat that can affect any user who accesses the administration panel, including legitimate network administrators who may unknowingly trigger the malicious script during routine configuration tasks. The vulnerability's persistence is particularly concerning as it remains active until the device is rebooted or the malicious content is manually removed from the device's storage, making it a long-term threat to network security.
The operational impact of this vulnerability extends beyond simple script execution and represents a significant security risk for network infrastructure. An attacker who successfully exploits this vulnerability can gain unauthorized access to sensitive network configuration data, potentially allowing for complete network takeover or manipulation of critical routing parameters. The attack can be executed remotely without requiring physical access to the device, making it particularly dangerous in enterprise environments where multiple administrators may access the same management interface. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where adversaries can leverage stored XSS to execute malicious code in the browser context of authenticated users, potentially leading to privilege escalation or data exfiltration. The widespread nature of affected devices means that numerous network environments could be compromised simultaneously, creating a significant attack surface for threat actors.
Mitigation strategies for this stored XSS vulnerability should include immediate firmware updates to versions that address the identified security flaw, as provided by NETGEAR through their security advisory channels. Network administrators should implement strict access controls and monitoring of the device management interfaces to detect unusual activity or unauthorized access attempts. The principle of least privilege should be enforced when configuring administrative access, limiting the number of users with elevated privileges and implementing multi-factor authentication where possible. Network segmentation and firewall rules should be configured to restrict access to management interfaces from trusted networks only, reducing the attack surface available to external threat actors. Additionally, implementing web application firewalls or security monitoring solutions that can detect and block malicious script injection attempts provides an additional layer of protection. Regular security audits and vulnerability assessments should be conducted to identify similar issues across the network infrastructure, as this vulnerability demonstrates a pattern of insufficient input validation that may exist in other components of the device firmware or web interface implementation.