How severe is CVE-2020-12126?

CVE-2020-12126 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-12126 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12126?

CVE-2020-12126 affects Wavlink Wn530h4 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12126?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-12126 published?

CVE-2020-12126 was published on 2020-10-02 and last updated on 2026-06-17.

CVE-2020-12126

CVE-2020-12126 is a critical-severity vulnerability in Wavlink Wn530h4 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Wavlink Wn530h4 Firmware
Published: 2020-10-02
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-12126?: CVE-2020-12126 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-12126 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12126?: CVE-2020-12126 affects Wavlink Wn530h4 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12126?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12126 published?: CVE-2020-12126 was published on 2020-10-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:wavlink:wn530h4_firmware:m30h4.v5030.190403:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
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