Description
A flaw has been found in Wavlink NU516U1 240425. The impacted element is the function sys_login1 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.
Published: 2026-05-10
Score: 5.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A flaw in the login.cgi script of the Wavlink NU516U1 router allows an attacker to manipulate the ipaddr parameter in the sys_login1 function, leading to operating system command injection. An attacker can supply crafted input that is executed by the firmware’s shell, enabling arbitrary command execution and thereby compromising the device’s confidentiality, integrity, and availability. This vulnerability manifests as a direct remote code execution flaw, classified under CWE‑77 and CWE‑78.

Affected Systems

The affected device is the Wavlink NU516U1 router, firmware version 240425. The issue resides in the sys_login1 routine of /cgi-bin/login.cgi, which processes login requests forwarded from the web interface.

Risk and Exploitability

The CVSS score of 5.3 suggests a moderate severity. EPSS data is not available, but the vulnerability is listed as not in the KEV catalog. The flaw can be exploited over the network; an attacker can remotely send a malicious request to the login.cgi endpoint, triggering the command injection. Published exploits indicate that attackers have actively used code to take control of these routers, which elevates the practical risk even with a moderate CVSS figure.

Generated by OpenCVE AI on May 10, 2026 at 05:20 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest firmware update that removes the vulnerable sys_login1 function from the router.
  • If a patch is unavailable, block or restrict remote access to the router’s web interface, ensuring that only trusted internal IP ranges can reach /cgi-bin/login.cgi; this mitigates the attack surface for the command injection.
  • Consider disabling or removing the login.cgi endpoint entirely through the router’s configuration settings, preventing the vulnerable service from being exposed to untrusted networks.

Generated by OpenCVE AI on May 10, 2026 at 05:20 UTC.

Tracking

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Advisories

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History

Sun, 10 May 2026 04:45:00 +0000

Type Values Removed Values Added
Description A flaw has been found in Wavlink NU516U1 240425. The impacted element is the function sys_login1 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.
Title Wavlink NU516U1 login.cgi sys_login1 os command injection
Weaknesses CWE-77
CWE-78
References
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

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-05-10T04:30:09.029Z

Reserved: 2026-05-09T07:54:57.297Z

Link: CVE-2026-8230

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-10T05:16:12.900

Modified: 2026-05-10T05:16:12.900

Link: CVE-2026-8230

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-10T05:30:05Z

Weaknesses