What is the CVSS score of CVE-2025-67187?

CVE-2025-67187 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: 0.2%.

Which versions of A950rg Firmware are 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.

Is there a public PoC exploit available for CVE-2025-67187?

Yes, a public proof-of-concept exploit is available for CVE-2025-67187. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate 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.

A950rg Firmware CVE-2025-67187

CRITICAL

Stack-based Buffer Overflow (CWE-121)

2026-02-03 cve@mitre.org

Buffer Overflow Stack Overflow A950rg Firmware 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 - 14:14 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

CRITICAL 9.8

DescriptionCVE.org

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.

AnalysisAI

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

Technical ContextAI

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.