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: 4.9% Low
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. The EPSS score is 5%, indicating a moderate likelihood of exploitation. The vulnerability is not listed in the KEV catalog. The flaw can be exploited send a login.cgi endpoint, triggering the command injection. Published exploits are available, but there is no confirmed evidence that attackers have actively used the exploit in the wild.

Generated by OpenCVE AI on June 18, 2026 at 13:07 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 June 18, 2026 at 13:07 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 12 May 2026 17:45:00 +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 15:15:00 +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

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

Wavlink Wl-nu516u1 Wl-nu516u1 Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-05-11T14:53:10.116Z

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

Link: CVE-2026-8230

cve-icon Vulnrichment

Updated: 2026-05-11T14:53:05.824Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-06-17T11:03:41.183

Link: CVE-2026-8230

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-18T13:15:15Z

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')