EUVD-2026-16961Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | The vulnerability presents a moderate real-world risk despite its sub-7.0 CVSS score. The CVSS vector indicates attack complexity is low (AC:L) and no user interaction is required (UI:N), with network accessibility (AV:N) but requiring login (PR:L). The publicly available exploit code (POC=YES) significantly elevates practical risk, as threat actors can readily weaponize this without reverse-engineering. The EPSS vector component E:P (Proof of Concept Functional) confirms proof-of-concept exists. However, the authentication requirement (PR:L) limits the attack surface to users with valid credentials - either compromised accounts or administrative access. The moderate CVSS impact (C:L, I:L, A:L) means attackers gain partial confidentiality, integrity, and availability compromise but not complete system takeover. Organizations with Totolik A3600R devices exposed to untrusted networks or shared credentials should prioritize patching, but this is not a critical RCE from the internet perimeter without prior authentication compromise. |
| Exploit ScenarioDerived | An attacker with valid credentials to the router's web interface (obtained through credential stuffing, phishing, or prior account compromise) sends a specially crafted HTTP request to /cgi-bin/cstecgi.cgi with the setNoticeCfg function and injects shell commands in the NoticeUrl parameter, such as NoticeUrl=http://example.com|whoami or NoticeUrl=$(malicious_command). The router processes this input without sanitization and executes the injected command on the system, potentially allowing the attacker to exfiltrate configuration data, modify firewall rules, create backdoor accounts, or pivot to other network devices. Publicly available exploit code referenced in the VulDB CTI source simplifies weaponization of this attack. |
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Alert meAnalysisAIv1 – Mar 29, 2026
Command injection in Totolink A3600R firmware 4.1.2cu.5182_B20201102 allows authenticated remote attackers to execute arbitrary commands via the NoticeUrl parameter in the setNoticeCfg function of /cgi-bin/cstecgi.cgi. The vulnerability has a CVSS score of 6.3 (low-to-medium severity) but is confirmed by publicly available exploit code, making it an active threat to deployed devices despite the authentication requirement.
RemediationAI
Apply the latest firmware patch released by Totolink for the A3600R model, available at https://www.totolink.net/. If an updated firmware version with a build number later than 5182_B20201102 is available, download and flash it via the router's web interface or management console following Totolink's official upgrade procedures. As an interim mitigation, restrict access to the router's web management interface to trusted IP addresses only using firewall rules or router ACLs, and ensure all administrative accounts use strong, unique passwords to reduce the risk of credential compromise. Additionally, disable remote management features if not actively required.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability exists in the Parameter Handler component of the Totolink A3600R router's web interface. The setNoticeCfg function fails to properly sanitize user-supplied input in the NoticeUrl parameter before passing it to system command execution, violating CWE-77 (Improper Neutralization of Special Elements used in a Command). The web-accessible CGI script /cgi-bin/cstecgi.cgi processes this parameter without input validation, allowing an authenticated user to inject shell metacharacters and execute arbitrary operating system commands on the router with the privileges of the CGI process.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl results in command injection. The attack may be launched remotely. The exploit is now public and may be used.
Executive ViewAI
Organizations using A vulnerability should be aware of moderate risk from CVE-2026-5020, a command injection vulnerability rated CVSS 5.3. Exploitation could allow attackers to execute code or inject malicious input. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: deploy WAF rules, restrict network access, enable logging.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
OS command injection occurs when an application passes unsanitized user input directly into system shell commands.
GitHub PoC
Exploit-DB