How severe is CVE-2026-3613?

CVE-2026-3613 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3613 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3613?

CVE-2026-3613 affects Wavlink Wl-nu516u1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3613?

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

Does CVE-2026-3613 have an EU (EUVD) identifier?

Yes. CVE-2026-3613 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9965.

When was CVE-2026-3613 published?

CVE-2026-3613 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-3613

CVE-2026-3613 is a high-severity vulnerability in Wavlink Wl-nu516u1 Firmware with a CVSS 3.x base score of 7.2. 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 8.3
CVSS v4: 7.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9965
Weakness: CWE-119
Affected product: Wavlink Wl-nu516u1 Firmware
Published: 2026-03-06
Last modified: 2026-06-17

Description

A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Frequently asked questions

What is CVE-2026-3613?: A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.
How severe is CVE-2026-3613?: CVE-2026-3613 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3613 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3613?: CVE-2026-3613 affects Wavlink Wl-nu516u1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3613?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3613 have an EU (EUVD) identifier?: Yes. CVE-2026-3613 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9965.
When was CVE-2026-3613 published?: CVE-2026-3613 was published on 2026-03-06 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Wavlink Wl-nu516u1 Firmware

CVE-2026-3703 — Critical (CVSS 9.8): A flaw has been found in Wavlink NU516U1 251208. This affects the function sub_401A10 of the file /cgi-bin/login.cgi.…
CVE-2026-4861 — High (CVSS 8.8): A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file…
CVE-2026-3612 — High (CVSS 7.2): A vulnerability was determined in Wavlink WL-NU516U1 V240425. This affects the function sub_405AF4 of the file…
CVE-2026-2615 — High (CVSS 7.2): A flaw has been found in Wavlink WL-NU516U1 up to 20251208. The affected element is the function…
CVE-2026-2567 — High (CVSS 7.2): A vulnerability was detected in Wavlink WL-NU516U1 20251208. This vulnerability affects the function sub_401218 of the…
CVE-2026-2565 — Medium (CVSS 6.6): A weakness has been identified in Wavlink WL-NU516U1 20251208. Affected by this issue is the function sub_40785C of the…

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