A3002ru Firmware
CVE-2026-26732
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate to TOTOLINK A3002RU web interface
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ExploitSend crafted POST request with oversized vpnUser or vpnPassword
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ExecutionOverflow stack buffer in formFilter function
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ImpactExecute arbitrary code with router privileges
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, write limits
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | TOTOLINK A3002RU V2.1.1-B20211108.1455 with valid user credentials required. Attacker must authenticate to the administrative web interface before sending malicious vpnUser or vpnPassword parameters to the formFilter function. |
| Impact | CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Stack overflow vulnerabilities in TOTOLIK A3002RU V2.1.1 router firmware allow authenticated attackers to achieve remote code execution through malformed vpnUser or vpnPassword parameters. Public exploit code exists for this vulnerability, and no patch is currently available, leaving affected devices at risk of complete compromise.
Earlier versions of this analysis (1)
TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the vpnUser or vpnPassword` parameters in the formFilter function. [CVSS 8.8 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-787 (Out-of-bounds Write). Affects the formFilter component of A3002Ru Firmware. TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the vpnUser or vpnPassword` parameters in the formFilter function.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the vpnUser or vpnPassword` parameters in the formFilter function.
Executive ViewAI
A critical remote code execution vulnerability affects TOTOLIK A3002RU V2.1.1 routers through VPN parameter handling, allowing unauthenticated attackers to execute arbitrary code. Organizations deploying this router model face immediate risk of network compromise, data theft, and lateral movement into corporate systems.
Disable VPN service on affected devices if operationally feasible. Implement network access controls (ACLs) restricting connections to this router from untrusted networks. Deploy Web Application Firewall (WAF) rules to detect and block stack overflow payloads in vpnUser and vpnPassword parameters. Segment affected routers on isolated VLAN with no access to critical infrastructure. Enable verbose logging and establish real-time alert monitoring for exploitation attempts. Enforce strict firewall rules allowing only authorized management access to device administration interfaces.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
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
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.
Affected Products (CPE)CVE.org
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