How severe is CVE-2026-3661?

CVE-2026-3661 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-3661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3661?

CVE-2026-3661 affects Wavlink Wl-nu516u1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3661?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3661 have an EU (EUVD) identifier?

Yes. CVE-2026-3661 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10141.

When was CVE-2026-3661 published?

CVE-2026-3661 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-3661

CVE-2026-3661 is a medium-severity vulnerability in Wavlink Wl-nu516u1 Firmware with a CVSS 3.x base score of 4.7. Its EPSS exploit-prediction score of 11% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v2: 5.8
CVSS v4: 2.0
EPSS exploit prediction: 11% (96th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10141
Weakness: CWE-74
Affected product: Wavlink Wl-nu516u1 Firmware
Published: 2026-03-07
Last modified: 2026-06-17

Description

A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.

Frequently asked questions

What is CVE-2026-3661?: A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.
How severe is CVE-2026-3661?: CVE-2026-3661 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-3661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3661?: CVE-2026-3661 affects Wavlink Wl-nu516u1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3661?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3661 have an EU (EUVD) identifier?: Yes. CVE-2026-3661 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10141.
When was CVE-2026-3661 published?: CVE-2026-3661 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:wavlink:wl-nu516u1_firmware:m16u1_v240425:*:*:*:*:*:*:*

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