How to fix CVE-2025-67187?

Within 24 hours: Identify and inventory all A950Rg devices with firmware versions up to 4.1.2cu.5204_b20210112; isolate critical systems from internet-facing exposure and restrict network access to trusted sources only. Within 7 days: Implement network segmentation and WAF rules to block exploitation attempts; monitor for active exploitation attempts in logs and establish incident response readiness. Within 30 days: Contact vendor for emergency firmware updates or migration timeline; deploy compensating controls; conduct forensic review of affected systems for signs of compromise.

Is Stack Overflow affected by CVE-2025-67187?

A critical stack-based buffer overflow vulnerability (CVE-2025-67187) affects A950Rg firmware versions up to 4.1.2cu.5204_b20210112, with a CVSS score of 9.8 and active public exploits available.

CVE-2025-67187

CRITICAL

2026-02-03 [email protected]

9.8

CVSS 3.1

CVSS Vector

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 - 14:14 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

CRITICAL 9.8

Description

A stack-based buffer overflow vulnerability was identified in TOTOLINK A950RG V4.1.2cu.5204_B20210112. The flaw exists in the setIpQosRules interface of /lib/cste_modules/firewall.so where the comment parameter is not properly validated for length.

Analysis

TOTOLINK A950RG has a stack-based buffer overflow in a second endpoint, providing an additional RCE vector through the router's CGI interface.

Technical Context

A CWE-121 stack-based buffer overflow in a different function of TOTOLINK A950RG's cstecgi.cgi, the second overflow discovered in this firmware version.

Affected Products

['TOTOLINK A950RG V4.1.2cu.5204_B20210112']

Remediation

Update firmware for all three overflow vulnerabilities.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.2

CVSS: +49

POC: +20

CVE-2025-67187 vulnerability details – vuln.today

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CVE-2025-67187

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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CVE-2025-67187

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

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External POC / Exploit Code