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%.

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

View

Vulnerability Assessment

Weakness	CWE CWE-121 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Stack buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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. Sign in to read
Impact	CVSS 9.8 with PoC. Multiple overflows in the same router increase exploitation reliability for botnet operators.
Exploit ScenarioDerived	An attacker uses this alternative overflow when the setUrlFilterRules path is patched, maintaining the ability to compromise the router.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 9.8

Second stack overflow in TOTOLINK A950RG provides alternative RCE path.

RemediationAI

Update firmware for all three overflow vulnerabilities.

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

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.

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Exploit and PoC references, threat intelligence from 22 sources

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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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

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.

Executive ViewAI

Why It Matters

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. Organizations running affected firmware versions face immediate risk of system compromise, data breach, and operational disruption, as the vulnerability enables unauthenticated remote code execution.

Business Impact: Severe

Compensating Controls

Implement network segmentation to isolate A950Rg devices from critical infrastructure; deploy Web Application Firewall (WAF) rules to detect and block stack buffer overflow exploit patterns; disable non-essential network services and protocols on affected devices; restrict administrative access to affected systems; implement egress filtering to prevent command and control communication; increase security monitoring and logging for anomalous behavior; consider temporary operational workarounds or manual processes to reduce attack surface until patch availability.

Threat Intelligence Overview

EPSS Score

0.2%

Top 57% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

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.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

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.

Stack-based Buffer Overflow HIGH

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.