Cyber Resilience

CVE-2026-8189

LowPublic PoC

Published: 09 May 2026

Published
09 May 2026
Modified
13 May 2026
KEV Added
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Patch
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CVSS Score v4 2.1 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0481 90.9th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-8189 is a low-severity Command Injection (CWE-77) vulnerability in Wavlink Wl-Nu516U1 Firmware. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 9.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

A vulnerability was found in Wavlink NU516U1 firmware version M16U1_V240425. The issue resides in the wzdrepeater function within /cgi-bin/adm.cgi, where manipulation of the wlan_bssid, sel_Automode, and sel_EncrypTyp arguments leads to operating system command injection. The flaw is tracked under CWE-77 and CWE-78 and carries a CVSS 4.0 score of 2.1 reflecting limited impact when exploited.

An authenticated remote attacker can supply crafted values to the affected parameters and execute arbitrary operating system commands on the device. Public exploit code has been released, enabling an attacker to achieve limited effects on confidentiality, integrity, and availability without requiring user interaction.

The EPSS score rose from a low of 0.0043 to a peak of 0.0106, indicating that exploitation interest increased after disclosure. The vendor was notified prior to publication, though no official patch or mitigation guidance appears in the referenced sources.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

A vulnerability was found in Wavlink NU516U1 M16U1_V240425. Affected by this vulnerability is the function wzdrepeater of the file /cgi-bin/adm.cgi. The manipulation of the argument wlan_bssid/sel_Automode/sel_EncrypTyp results in os command injection. It is possible to launch the attack remotely. The…

more

exploit has been made public and could be used. The vendor was contacted early about this disclosure.

CWE(s)
CWE-77CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

OS command injection (CWE-78) in remotely accessible /cgi-bin/adm.cgi directly enables exploitation of the public-facing web admin interface (T1190) and arbitrary Unix shell command execution (T1059.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-8192Same product: Wavlink Wl-Nu516U1
CVE-2026-8188Same product: Wavlink Wl-Nu516U1
CVE-2026-8230Same product: Wavlink Wl-Nu516U1
CVE-2026-8227Same product: Wavlink Wl-Nu516U1
CVE-2026-8229Same product: Wavlink Wl-Nu516U1
CVE-2026-8228Same product: Wavlink Wl-Nu516U1
CVE-2026-8191Same product: Wavlink Wl-Nu516U1
CVE-2026-8190Same product: Wavlink Wl-Nu516U1
CVE-2026-3662Same product: Wavlink Wl-Nu516U1
CVE-2026-3661Same product: Wavlink Wl-Nu516U1

Affected Assets

wavlink
wl-nu516u1 firmware
m16u1_v240425

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References