Description
A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Published: 2026-08-03
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

An attacker can manipulate the CONTENT_LENGTH argument to nas.cgi, causing the fgets function to overflow the stack. The stack-based buffer overflow can be exploited remotely, potentially leading to arbitrary code execution or denial of service on the device.

Affected Systems

The vulnerability exists in Wavlink WL‑NU516U1 firmware 708c073-mt7628.

Risk and Exploitability

The CVSS score of 9.3 indicates a critical severity. EPSS data is not available, and the vulnerability is not listed in the CISA KEV catalog. Because the attack vector is remote and the flaw is a classic stack-based overflow, exploitation is feasible from an external network if the web management interface is reachable.

Generated by OpenCVE AI on August 3, 2026 at 08:42 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Download the latest firmware release from the vendor website and apply the update to the device.
  • Follow the vendor's upgrade procedure, including a reboot if required, to ensure the new firmware is active.
  • Restrict external access to the device’s web management interface by placing it behind a firewall or VPN and limiting allowed IP addresses.

Generated by OpenCVE AI on August 3, 2026 at 08:42 UTC.

Tracking

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Advisories

No advisories yet.

History

Mon, 03 Aug 2026 08:00:00 +0000

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

Mon, 03 Aug 2026 06:45:00 +0000

Type Values Removed Values Added
Description A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Title Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow
First Time appeared Wavlink
Wavlink wl-nu516u1 Firmware
Weaknesses CWE-119
CWE-121
CPEs cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*
Vendors & Products Wavlink
Wavlink wl-nu516u1 Firmware
References
Metrics cvssV2_0

{'score': 10, 'vector': 'AV:N/AC:L/Au:N/C:C/I:C/A:C/E:ND/RL:OF/RC:C'}

cvssV3_0

{'score': 9.8, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X'}

Subscriptions

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

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-08-03T06:00:11.107Z

Reserved: 2026-08-02T20:33:29.434Z

Link: CVE-2026-18588

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T07:45:17Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-121

    Stack-based Buffer Overflow