What is the CVSS score of CVE-2026-3612?

CVE-2026-3612 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: 0.4%.

Is there a public PoC exploit available for CVE-2026-3612?

Yes, a public proof-of-concept exploit is available for CVE-2026-3612. Prioritise patching immediately. EPSS: 0.4%.

How to fix or mitigate CVE-2026-3612?

Within 24 hours: Inventory all Wavlink WL-NU516U1 devices in your environment and document network exposure. Within 7 days: Isolate affected devices to trusted networks only, disable remote management interfaces, and restrict access to /cgi-bin/adm.cgi via firewall rules. Within 30 days: Monitor Wavlink's security advisories for patch availability and prepare deployment procedures; consider device replacement if no patch becomes available within 90 days.

Wl Nu516u1 Firmware CVE-2026-3612

HIGH

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)

2026-03-06 cna@vuldb.com

Command Injection 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

Access /cgi-bin/adm.cgi endpoint
Exploit

Craft malicious firmware_url parameter
Execution

Inject shell commands into OTA upgrade function
Impact

Execute arbitrary commands on device

Vulnerability Assessment

Weakness	CWE CWE-74 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Input neutralization, injection prevention
Exploitation Conditions	Wavlink WL-NU516U1 V240425 with authenticated admin access (PR:H). Attacker requires high-privilege credentials to reach /cgi-bin/adm.cgi OTA Online Upgrade component accepting firmware_url argument without sanitization.
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 vulnerability to compromise the affected system.

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

No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Remote code execution in Wavlink WL-NU516U1 firmware allows unauthenticated attackers to execute arbitrary commands through the firmware_url parameter in the OTA upgrade function, requiring only high-level privileges to trigger. Public exploit code exists for this vulnerability and no patch is currently available, making it an immediate risk for affected devices.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 7.2

A vulnerability was determined in Wavlink WL-NU516U1 V240425. This affects the function sub_405AF4 of the file /cgi-bin/adm.cgi of the component OTA Online Upgrade. [CVSS 7.2 HIGH]

RemediationAI

Monitor vendor advisories for a patch. 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

Affects Wl-Nu516U1 Firmware. A vulnerability was determined in Wavlink WL-NU516U1 V240425. This affects the function sub_405AF4 of the file /cgi-bin/adm.cgi of the component OTA Online Upgrade. This manipulation of the argument firmware_url causes command injection. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

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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

Mar 10, 2026 - 18:29 vuln.today

Public exploit code

CVE Published

Mar 06, 2026 - 01:15 nvd

HIGH 7.2

DescriptionCVE.org

A vulnerability was determined in Wavlink WL-NU516U1 V240425. This affects the function sub_405AF4 of the file /cgi-bin/adm.cgi of the component OTA Online Upgrade. This manipulation of the argument firmware_url causes command injection. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

Executive ViewAI

Why It Matters

A high-severity vulnerability in Wavlink WL-NU516U1 devices affects the firmware upgrade component, potentially allowing unauthorized code execution. Organizations using this device model face immediate risk of compromise, particularly if devices are internet-facing or accessible to untrusted networks.

Business Impact: High

Compensating Controls

Restrict network access to affected devices using firewall rules blocking external connections to port 80/443 and /cgi-bin/adm.cgi endpoint. Disable OTA upgrade functionality if supported. Segment devices to isolated VLANs with minimal trust. Monitor for suspicious firmware upgrade attempts via logs. Deploy WAF rules to block requests to /cgi-bin/adm.cgi from untrusted sources. Given public exploit availability and lack of vendor patch, prioritize device isolation and replacement planning.

Threat Intelligence Overview

EPSS Score

0.4%

Top 40% 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 0.4%

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

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Affected Products (CPE)CVE.org

cpe:2.3:o:wavlink:wl-nu516u1_firmware:m16u1_v240425:*:*:*:*:*:*:*

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References

Advisories & patches

REF https://vuldb.com/?ctiid.349220 REF https://vuldb.com/?id.349220 REF https://vuldb.com/?submit.754668

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