What is the CVSS score of CVE-2025-67188?

CVE-2025-67188 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: 0.6%.

Is there a public PoC exploit available for CVE-2025-67188?

Yes, a public proof-of-concept exploit is available for CVE-2025-67188. Prioritise patching immediately. EPSS: 0.6%.

How to fix or mitigate CVE-2025-67188?

Within 24 hours: Inventory all A950Rg devices and firmware versions; isolate affected devices from untrusted networks if operationally feasible; enable enhanced monitoring and logging. Within 7 days: Implement network segmentation to restrict device access; deploy WAF rules to block exploit patterns; contact vendor for patch timeline and workarounds. Within 30 days: Apply vendor patch immediately upon release; conduct forensic analysis for signs of compromise; review access logs for exploitation attempts.

A950rg Firmware CVE-2025-67188

CRITICAL

Classic Buffer Overflow (CWE-120)

2026-02-03 cve@mitre.org

Buffer Overflow A950rg Firmware TOTOLINK

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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. Sign in to read
Impact	CVSS 9.8, EPSS 0.59% with PoC. Three overflows demonstrate systemic lack of input validation in TOTOLINK firmware.
Exploit ScenarioDerived	An attacker crafts an oversized RADVD configuration parameter to trigger the overflow and gain root access to the router.

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

No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

TOTOLINK A950RG has a third buffer overflow in setRadvdCfg providing yet another RCE vector through the router's IPv6 configuration interface.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 9.8

Third buffer overflow in TOTOLINK A950RG via IPv6 config handler.

RemediationAI

Update firmware. All three overflows must be patched.

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-120 buffer overflow in the setRadvdCfg function of TOTOLINK A950RG, the third overflow in this firmware. The RADVD configuration handles IPv6 router advertisements.

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 - 14:15 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

CRITICAL 9.8

DescriptionCVE.org

A buffer overflow vulnerability exists in TOTOLINK A950RG V4.1.2cu.5204_B20210112. The issue resides in the setRadvdCfg interface of the /lib/cste_modules/ipv6.so module. The function fails to properly validate the length of the user-controlled radvdinterfacename parameter, allowing remote attackers to trigger a stack buffer overflow.

Executive ViewAI

Why It Matters

A critical buffer overflow vulnerability (CVE-2025-67188, CVSS 9.8) affects A950Rg firmware versions up to 4.1.2cu.5204_b20210112, enabling remote code execution without authentication. With public exploits available and no patch currently released, organizations running affected devices face immediate risk of compromise and require urgent mitigation to prevent unauthorized access and data breach.

Business Impact: Severe

Compensating Controls

Implement strict network segmentation isolating affected A950Rg devices; deploy intrusion detection/prevention systems with signatures for CVE-2025-67188 exploit attempts; restrict administrative access and disable unnecessary services; apply WAF rules blocking buffer overflow payloads; enforce strict input validation at network perimeter; implement connection rate limiting; maintain detailed logging and monitoring for anomalous behavior; disable remote management protocols if not critical; consider temporary device replacement with patched alternatives if available.

Threat Intelligence Overview

EPSS Score

0.6%

Top 31% 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 0.6%

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: +1

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.