What is the CVSS score of CVE-2025-67186?

CVE-2025-67186 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.8%.

Which versions of A950rg Firmware are affected by CVE-2025-67186?

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.

Is there a public PoC exploit available for CVE-2025-67186?

Yes, a public proof-of-concept exploit is available for CVE-2025-67186. Prioritise patching immediately. EPSS: 0.8%.

How to fix or mitigate CVE-2025-67186?

Within 24 hours: Identify and inventory all A950Rg devices in your environment and isolate them from untrusted networks if possible; establish monitoring for exploit attempts. Within 7 days: Contact the vendor for patch availability and escalated timeline; implement network segmentation to limit device exposure; deploy WAF rules to block known exploit patterns if applicable. Within 30 days: Apply firmware patches immediately upon vendor release; conduct forensic review of device logs for signs of compromise; implement additional network access controls and threat detection signatures.

A950rg Firmware CVE-2025-67186

CRITICAL

Classic Buffer Overflow (CWE-120)

2026-02-03 cve@mitre.org

Buffer Overflow Denial Of Service A950rg Firmware RCE TOTOLINK

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 10, 2026 - 14:17 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

CRITICAL 9.8

DescriptionCVE.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.

AnalysisAI

TOTOLINK A950RG router firmware has a buffer overflow in setUrlFilterRules that allows remote attackers to execute code through the router's management interface.

Technical ContextAI

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.

RemediationAI

Update firmware. Restrict management interface access. Consider replacing end-of-life routers.

CVE-2025-67186 vulnerability details – vuln.today

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A950rg Firmware CVE-2025-67186

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code