Buffer overflow in Wavlink Wl-Nu516u1
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.008 · change: -0.004
Affected products
- Wavlink Wl-Nu516u1 — versions V240425
- Wavlink Wl-Nu516u1 Firmware — versions m16u1_v240425
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/Wlz1112/WAVLINK-NU516-V240425/blob/main/ipaddr_Stack Buffer Overflow… (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-3613?
- CVE-2026-3613 is a high-severity vulnerability in Wavlink Wl-Nu516u1, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.2/10. Published 2026-03-06.
- How severe is CVE-2026-3613?
- High severity. CVSS v3 base score is 7.2 out of 10.