CVE-2026-8190 - Vulnerability Details

- Wavlink NU516U1 adm.cgi wan os command injection

Description

A vulnerability was determined in Wavlink NU516U1 M16U1_V240425. Affected by this issue is the function wan of the file /cgi-bin/adm.cgi. This manipulation of the argument ppp_username/ppp_passwd/rwan_ip/rwan_mask/rwan_gateway is directly passed by the attacker/so we can control the ppp_username/ppp_passwd/rwan_ip/rwan_mask/rwan_gateway causes os command injection. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

Published: 2026-05-09

Score: 5.3 Medium

EPSS: 5.3% Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability exists in the wan function of /cgi-bin/adm.cgi on Wavlink NU516U1 routers. By manipulating the ppp_username, ppp_passwd, rwan_ip, rwan_mask, or rwan_gateway parameters, an attacker can inject arbitrary operating system commands (CWE-77). The attack exploits the unsanitized command substitution that can also be used to set environment variables (CWE-78). The attacker can then execute those commands remotely with the privileges of the web interface process, potentially taking control of the device, exfiltrating data, or using the router as chain.

Affected Systems

The flaw was found on Wavlink NU516U1 devices running the M16U1_V240425 firmware release. No other product or version information is listed.

Risk and Exploitability

The CVSS score of 5.3 indicates moderate overall risk. EPSS score is 5%, and the vulnerability is not listed in the CISA KEV catalog, suggesting limited known exploitation. The attack vector is inferred to be remote over the network, requiring the attacker to send a crafted HTTP request to the device’s administrative interface. While the vulnerability is publicly disclosed, there are no confirmed large‑scale attacks reported in the public record.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Wavlink

NU516U1

affected

Version	Status	Constraints
`M16U1_V240425`	affected	—

Configuration 1 [-]

AND

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

cpe:2.3:h:wavlink:wl-nu516u1:-:*:*:*:*:*:*:*

No data.

Vendor Product Confidence Versions

Wavlink

Wl-nu516u1

91%

Version	Status	Scheme	Platform
`M16U1_V240425`	affected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Upgrade the router firmware to the latest release that includes the fix for the adm.cgi command injection issue.
Restrict external access to the /cgi-bin/adm.cgi endpoint by configuring firewall rules or placing the device behind an internal network segment.
Use strong administrator credentials and enable any available multi‑factor authentication to reduce the risk of successful exploitation.

Generated by OpenCVE AI on June 18, 2026 at 08:19 UTC.

Tracking

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Advisories

No advisories yet.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.05344.

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/wudipjq/my_vuln/blob/main/Wavlink/vuln_3/3.md
https://vuldb.com/submit/800729
https://vuldb.com/vuln/362342
https://vuldb.com/vuln/362342/cti

History

Wed, 13 May 2026 16:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Wavlink wl-nu516u1 Firmware
CPEs		cpe:2.3:h:wavlink:wl-nu516u1:-:::::::* cpe:2.3:o:wavlink:wl-nu516u1_firmware:m16u1_v240425:::::::*
Vendors & Products		Wavlink wl-nu516u1 Firmware

Mon, 11 May 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sun, 10 May 2026 20:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Wavlink Wavlink wl-nu516u1
Vendors & Products		Wavlink Wavlink wl-nu516u1

Sat, 09 May 2026 17:45:00 +0000

Type	Values Removed	Values Added
Description		A vulnerability was determined in Wavlink NU516U1 M16U1_V240425. Affected by this issue is the function wan of the file /cgi-bin/adm.cgi. This manipulation of the argument ppp_username/ppp_passwd/rwan_ip/rwan_mask/rwan_gateway is directly passed by the attacker/so we can control the ppp_username/ppp_passwd/rwan_ip/rwan_mask/rwan_gateway causes os command injection. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.
Title		Wavlink NU516U1 adm.cgi wan os command injection
Weaknesses		CWE-77 CWE-78
References		https://github.com/wudipjq/my_vuln/blob/main/Wavlink/vuln_3/3.md https://vuldb.com/submit/800729 https://vuldb.com/vuln/362342 https://vuldb.com/vuln/362342/cti
Metrics		cvssV2_0 `{'score': 6.5, 'vector': 'AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}` cvssV3_0 `{'score': 6.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV3_1 `{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV4_0 `{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Wavlink Wl-nu516u1 Wl-nu516u1 Firmware

MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-05-09T17:15:08.656Z

Updated: 2026-05-11T17:21:24.425Z

Reserved: 2026-05-08T19:52:08.350Z

Link: CVE-2026-8190

Vulnrichment

Updated: 2026-05-11T17:12:33.446Z

NVD

Status : Analyzed

Published: 2026-05-09T18:16:22.293

Modified: 2026-06-17T11:03:36.157

Link: CVE-2026-8190

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-06-18T08:30:04Z

Weaknesses

CWE-77
Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

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