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CVE-2026-13538 Wavlink CVE debrief

CVE-2026-13538 is a command injection vulnerability in the Wavlink WL-NU516U1-A M16U1_V240425 device. The vulnerability exists in the sub_401D68 function of the /cgi-bin/wireless.cgi file, specifically in the POST parameter handler. An attacker can exploit this vulnerability by manipulating the SSID2G2, SSID5G2, AuthMethod2, and WPAPSK12 arguments, allowing for remote command injection. The exploit has been publicly disclosed and may be utilized. The affected component should be upgraded to a fixed version. The vendor, Wavlink, was contacted and responded professionally, releasing a fixed version of the affected product.

Vendor
Wavlink
Product
WL-NU516U1-A
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-29
Original CVE updated
2026-06-29
Advisory published
2026-06-29
Advisory updated
2026-06-29

Who should care

Organizations and individuals using the Wavlink WL-NU516U1-A M16U1_V240425 device should be aware of this vulnerability and take necessary steps to mitigate it. This includes upgrading to a fixed version of the device and monitoring for any suspicious activity. Additionally, network administrators and security teams should review their inventory of Wavlink devices and prioritize patching this vulnerability.

Technical summary

The vulnerability exists in the sub_401D68 function of the /cgi-bin/wireless.cgi file, specifically in the POST parameter handler. An attacker can exploit this vulnerability by manipulating the SSID2G2, SSID5G2, AuthMethod2, and WPAPSK12 arguments, allowing for remote command injection. The CVSS score for this vulnerability is 2.1, indicating a low severity. However, the exploit has been publicly disclosed and may be utilized, making it essential to upgrade to a fixed version of the device.

Defensive priority

This vulnerability has a low CVSS score, but it is still essential to prioritize patching it. The exploit has been publicly disclosed, and an attacker can easily exploit this vulnerability to inject commands remotely.

Recommended defensive actions

  • Upgrade to a fixed version of the Wavlink WL-NU516U1-A M16U1_V240425 device.
  • Monitor for any suspicious activity on the device and network.
  • Review inventory of Wavlink devices and prioritize patching this vulnerability.
  • Implement additional security measures, such as network segmentation and access controls, to limit the attack surface.
  • Continuously monitor for new vulnerabilities and updates for Wavlink devices.

Evidence notes

The CVE-2026-13538 vulnerability was discovered in the Wavlink WL-NU516U1-A M16U1_V240425 device. The vulnerability exists in the sub_401D68 function of the /cgi-bin/wireless.cgi file, specifically in the POST parameter handler. The exploit has been publicly disclosed and may be utilized. The vendor, Wavlink, was contacted and responded professionally, releasing a fixed version of the affected product.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13538 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13538

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13538 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13538

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.