What is CVE-2020-12126?

CVE-2020-12126 is a critical-severity vulnerability in Wavlink Wn530h4, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-10-02.

How severe is CVE-2020-12126?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Wavlink Wn530h4

CVE-2020-12126

Multiple authentication bypass vulnerabilities in the /cgi-bin/ endpoint of the WAVLINK WN530H4 M30H4.V5030.190403 allow an attacker to leak router settings, change configuration variables, and cause denial of service via an unauthenticated endpoint.

Vulnerability class: Broken Authentication

Published 2020-10-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Wavlink Wn530h4
Wavlink Wn530h4 Firmware — versions m30h4.v5030.190403

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.wavlink.com/en_us/product/WL-WN530H4.html (Product, Vendor Advisory)
cerne.xyz/bugs/CVE-2020-12126 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-12126?: CVE-2020-12126 is a critical-severity vulnerability in Wavlink Wn530h4, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-10-02.
How severe is CVE-2020-12126?: Critical severity. CVSS v3 base score is 9.8 out of 10.