CVE-2026-3703: Wavlink NU516U1

Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write

CVSS 9.3 CriticalCriticalEPSS 0.0093 · 61st percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

Published by the CVE Program (CNA: VulDB) at 8 Mar 2026, 04:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Wavlink	NU516U1	affected 251208

Identifiers

CVE-2026-3703

CNA

VulDB

Weakness (CWE)

CWE-119 · CWE-787

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P	CNA (VulDB)Used for this record
9.8	Critical	3.1	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	CNA (VulDB)
9.8	Critical	3.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C	CNA (VulDB)
10.0	High	2.0	AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0093, the 61st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 8 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

vuldb.com/?id.349649 vdb-entrytechnical-description
vuldb.com/?ctiid.349649 signaturepermissions-required
vuldb.com/?submit.759226 third-party-advisory
github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md related
dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin patch
github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc exploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.