CVE-2020-35813 in D7800
Summary
by MITRE • 12/30/2020
Certain NETGEAR devices are affected by stored XSS. This affects D7800 before 1.0.1.56, RBK50 before 2.3.5.30, RBR50 before 2.3.5.30, RBS50 before 2.3.5.30, RBK40 before 2.3.5.30, RBR40 before 2.3.5.30, RBS40 before 2.3.5.30, RBK20 before 2.3.5.26, RBR20 before 2.3.5.26, RBS20 before 2.3.5.26, XR700 before 1.0.1.10, R7500v2 before 1.0.3.46, R7800 before 1.0.2.74, R8900 before 1.0.4.28, R9000 before 1.0.4.28, XR500 before 2.3.2.56, and RAX120 before 1.0.0.78.
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Analysis
by VulDB Data Team • 06/20/2026
This vulnerability represents a stored cross-site scripting flaw that affects multiple NETGEAR wireless routers and networking devices across various product lines. The issue stems from inadequate input validation and output encoding within the web interface components of these devices, allowing attackers to inject malicious scripts that persist in the device's memory and execute when legitimate users access the affected web interface. The vulnerability impacts a significant number of consumer and small office networking devices, including the D7800, RBR50, RBK50, RBS50, and numerous other models across different firmware versions, with specific vulnerable versions ranging from early firmware releases through to versions prior to the security patches mentioned in the affected device list.
The technical exploitation of this stored XSS vulnerability occurs when an attacker can inject malicious JavaScript code into parameters that are subsequently stored on the device and executed in the context of the victim's browser session. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, and according to ATT&CK framework, represents a technique categorized under T1566.001 - Phishing: Spearphishing Attachment, where the malicious payload is delivered through web interface manipulation. The attack vector typically involves an attacker accessing the device's web management interface with administrative privileges or exploiting a vulnerability that allows unauthenticated access to inject malicious content into parameters that are then stored in the device's configuration or session management components.
The operational impact of this vulnerability is significant for network administrators and end users who rely on these networking devices for their network infrastructure. Once exploited, the stored XSS could enable attackers to steal session cookies, perform unauthorized administrative actions, redirect users to malicious sites, or extract sensitive configuration information from the device. The persistent nature of the stored payload means that even after the initial injection, the malicious code continues to execute whenever the affected web interface is accessed by any user, including legitimate administrators who may unknowingly trigger the execution of the malicious script. This creates a long-term risk for network security where the compromised device becomes a persistent threat vector within the network infrastructure.
Mitigation strategies for this vulnerability should include immediate firmware updates to the latest secure versions provided by NETGEAR, as these updates typically contain proper input validation and output encoding fixes. Network segmentation and access control measures can help limit the potential impact by restricting direct access to device management interfaces from untrusted networks. Additionally, implementing web application firewalls or security monitoring solutions that can detect and block malicious script injections can provide additional defense in depth. Administrators should also consider disabling web management interfaces when not actively needed and implementing strong authentication controls with multi-factor authentication where available. According to industry best practices and NIST guidelines, regular security assessments and vulnerability scanning of network infrastructure should be conducted to identify and remediate similar stored XSS vulnerabilities across all network devices and applications.