What is the CVSS score of CVE-2026-2567?

CVE-2026-2567 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-2567?

Yes, a public proof-of-concept exploit is available for CVE-2026-2567. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2567?

Within 24 hours: Inventory all Wavlink WL-NU516U1 devices in your environment and isolate them to trusted networks only; disable remote management access if not operationally critical. Within 7 days: Implement network segmentation to restrict access to /cgi-bin/nas.cgi endpoints; deploy WAF rules to block suspicious requests to this path; establish daily monitoring for exploit attempts. Within 30 days: Monitor vendor advisories for patch availability; prepare for immediate deployment upon release; evaluate replacement with alternative vendors if patch timeline extends beyond 60 days.

Wl Nu516u1 Firmware CVE-2026-2567

HIGH

Buffer Overflow (CWE-119)

2026-02-16 cna@vuldb.com

Buffer Overflow Stack Overflow Wl Nu516u1 Firmware Wavlink

7.2

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted HTTP request to /cgi-bin/nas.cgi
Exploit

Manipulate User1Passwd parameter with oversized payload
Execution

Overflow stack buffer in sub_401218
Impact

Execute arbitrary code with device privileges

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Wavlink WL-NU516U1 firmware version 20251208 with /cgi-bin/nas.cgi accessible; requires high-privilege authentication (PR:H) to manipulate User1Passwd parameter in nas.cgi handler function.
Impact	CVSS 7.2 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: High. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this flaw, stack-based buffer overflow.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Remote code execution in Wavlink WL-NU516U1 firmware through a stack-based buffer overflow in the nas.cgi User1Passwd parameter allows unauthenticated network attackers to achieve full system compromise. Public exploit code exists for this vulnerability, and no patch is currently available, leaving affected devices at immediate risk.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 7.2

A vulnerability was detected in Wavlink WL-NU516U1 20251208. This vulnerability affects the function sub_401218 of the file /cgi-bin/nas.cgi. [CVSS 7.2 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

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

Classified as CWE-119 (Buffer Overflow). Affects Wl-Nu516U1 Firmware. A vulnerability was detected in Wavlink WL-NU516U1 20251208. This vulnerability affects the function sub_401218 of the file /cgi-bin/nas.cgi. Performing a manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack may be initiated remotely. The exploit is now public and may be used.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.2 HIGH

AV:N/AC:L/PR:H/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

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Feb 18, 2026 - 19:41 vuln.today

Public exploit code

CVE Published

Feb 16, 2026 - 18:19 nvd

HIGH 7.2

DescriptionCVE.org

A vulnerability was detected in Wavlink WL-NU516U1 20251208. This vulnerability affects the function sub_401218 of the file /cgi-bin/nas.cgi. Performing a manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack may be initiated remotely. The exploit is now public and may be used.

Executive ViewAI

Why It Matters

A HIGH severity vulnerability (CVE-2026-2567) affects Wavlink WL-NU516U1 network devices with no vendor patch currently available. Organizations using this device model face potential unauthorized access or command execution risks, and immediate interim protections are required to prevent exploitation while a patch is developed.

Business Impact: High

Compensating Controls

Implement Web Application Firewall (WAF) rules to block or rate-limit requests to /cgi-bin/nas.cgi; restrict network access to affected devices via firewall rules (least-privilege access); disable the NAS CGI service if not operationally required; segment affected devices to isolated VLANs; implement intrusion detection/prevention signatures for CVE-2026-2567 exploitation attempts; enforce strong authentication and monitor admin access logs; consider temporary device replacement with patched alternatives.

Threat Intelligence Overview

EPSS Score

0.1%

Top 74% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

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 HIGH

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

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.