A950rg Firmware
CVE-2025-67186
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
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 | CVSS 9.8, EPSS 0.85% with PoC. First of three TOTOLINK A950RG buffer overflows. Router vulnerabilities are actively targeted by botnets. |
| Exploit ScenarioDerived | An attacker sends crafted URL filter rules to the TOTOLINK management interface, overflowing the buffer and gaining root access to the router. |
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Alert meAnalysisAIv1 – Mar 12, 2026
TOTOLINK A950RG router firmware has a buffer overflow in setUrlFilterRules that allows remote attackers to execute code through the router's management interface.
Earlier versions of this analysis (1)
Buffer overflow in TOTOLINK A950RG URL filter enables router RCE.
RemediationAI
Update firmware. Restrict management interface access. Consider replacing end-of-life routers.
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
TOTOLINK A950RG V4.1.2cu.5204_B20210112 has a CWE-120 buffer overflow in the setUrlFilterRules function of /cgi-bin/cstecgi.cgi, triggered by oversized URL filter rule parameters.
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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:N/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 A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability in the setUrlFilterRules interface of /lib/cste_modules/firewall.so. The vulnerability occurs because the url parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service.
Executive ViewAI
A critical buffer overflow vulnerability (CVE-2025-67186) affects A950Rg devices running firmware up to version 4.1.2cu.5204_b20210112, with a CVSS score of 9.8 and active public exploits available. Organizations using these devices face immediate risk of remote code execution, system compromise, and potential data breach, requiring urgent mitigation action.
Implement network segmentation to restrict A950Rg device communication to trusted internal networks only; disable unnecessary services and features on affected devices; deploy network-based intrusion detection/prevention (IDS/IPS) configured to detect buffer overflow exploit traffic; restrict administrative access to affected devices via firewall rules; enable verbose logging and increase monitoring frequency for these assets; consider temporary replacement with patched alternative devices if operationally feasible pending vendor patch release.
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.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
More in A950rg Firmware
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TOTOLINK A950RG V4.1.2cu.5161_B20200903 was found to contain a pre-auth remote command execution vulnerability in the se
TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability in the set
TOTOLINK A800R V4.1.2cu.5137_B20200730, A810R V4.1.2cu.5182_B20201026, A830R V4.1.2cu.5182_B20201102, A950RG V4.1.2cu.51
TOTOLINK A950RG V4.1.2cu.5204_B20210112 contains a command execution vulnerability in the setDeviceName interface of the
A command execution vulnerability exists in the TOTOLINK A950RG V4.1.2cu.5204_B20210112. Rated critical severity (CVSS 9
TOTOLINK A950RG has a third buffer overflow in setRadvdCfg providing yet another RCE vector through the router's IPv6 co
TOTOlink A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability. Rated critical severity (CVSS 9.8), th
TOTOLINK A950RG has a stack-based buffer overflow in a second endpoint, providing an additional RCE vector through the r
Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137
Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137
Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137
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