What is CVE-2026-13538?

CVE-2026-13538 is a medium-severity vulnerability in Wavlink Wl-Nu516u1-A, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-06-29.

How severe is CVE-2026-13538?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in Wavlink Wl-Nu516u1-A

CVE-2026-13538

A vulnerability was determined in Wavlink WL-NU516U1-A M16U1_V240425. The affected element is the function sub_401D68 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. This manipulation of the argument SSID2G2/SSID5G2/AuthMethod2/WPAPSK12 causes command injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Published 2026-06-29 · last modified 2026-06-29.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.022 (81.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Wavlink Wl-Nu516u1-A — versions M16U1_V240425

Weakness classification (CWE)

References

vuldb.com/vuln/374546 (technical-description, vdb-entry)
vuldb.com/vuln/374546/cti (signature, permissions-required)
vuldb.com/cve/CVE-2026-13538 (third-party-advisory)
vuldb.com/submit/834019 (third-party-advisory)
vuldb.com/submit/834021 (third-party-advisory)
vuldb.com/submit/834022 (third-party-advisory)
vuldb.com/submit/834023 (third-party-advisory)
github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-multissid-… (related)
github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-multissid-… (exploit)
dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-06-22-5ccde97-mt7628-squas… (patch)

Frequently asked questions

What is CVE-2026-13538?: CVE-2026-13538 is a medium-severity vulnerability in Wavlink Wl-Nu516u1-A, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-06-29.
How severe is CVE-2026-13538?: Medium severity. CVSS v3 base score is 6.3 out of 10.