Buffer overflow in Wavlink Nu516u1
CVE-2026-3703
A flaw has been found in Wavlink NU516U1 251208. This affects the function sub_401A10 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to out-of-bounds write. The attack may be performed from remote…
Vulnerability class: Buffer Overflow
EPSS: 0.003 (53.1th percentile) — read the EPSS interpretation.
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/E:P/RL:O/RC:C.
Affected products
- Wavlink Nu516u1 — versions 251208
Weakness classification (CWE)
References
- VDB-349649 | Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write (vdb-entry, technical-description)
- VDB-349649 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #759226 | Wavlink NU516U1 V251208 Stack-based Buffer Overflow (third-party-advisory)
- github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md (related)
- github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md (exploit)
- dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squas… (patch)
Frequently asked questions
- What is CVE-2026-3703?
- CVE-2026-3703 is a critical-severity vulnerability in Wavlink Nu516u1, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-03-08.
- How severe is CVE-2026-3703?
- Critical severity. CVSS v3 base score is 9.8 out of 10.