PT-2026-23858 · Wavlink · Wavlink Nu516U1

Haimianbaobao + 1 · Published 2026-03-07 · Updated 2026-03-13 · CVE-2026-3703

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Wavlink NU516U1 version 251208

Description A flaw exists in the Wavlink NU516U1 device, specifically within the /cgi-bin/login.cgi file. Manipulation of the ipaddr argument in this file can lead to an out-of-bounds write condition, potentially allowing for remote code execution. The vulnerable function is sub 401A10. This issue is network-accessible and does not require authentication. A public proof-of-concept exploit is available. Successful exploitation could allow attackers to gain full control of the device and potentially pivot into internal networks.

Recommendations Upgrade the affected component to a fixed version.

Exploit

Fix

RCE

Memory Corruption

Buffer Overflow

Weakness Enumeration

CWE-787

CWE-119

Related Identifiers

CVE-2026-3703

Affected Products

Wavlink Nu516U1

References · 20

• 🔥 https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-3703 · Security Note
• https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3703 · Vendor Advisory
• https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin · Patch
• https://twitter.com/CVEnew/status/2030747885181276475 · Twitter Post
• https://t.me/cveNotify/154659 · Telegram Post
• https://twitter.com/PurpleOps_io/status/2030878931553841526 · Twitter Post
• https://twitter.com/0dayPublishing/status/2030507271243870277 · Twitter Post
• https://twitter.com/cracbot/status/2032411412338000054 · Twitter Post
• https://twitter.com/TheHackerWire/status/2030557905238515989 · Twitter Post
• https://twitter.com/vuldb/status/2030207981619745005 · Twitter Post
• https://vuldb.com/?ctiid.349649 · Note
• https://vuldb.com/?id.349649 · Note
• https://twitter.com/CveFindCom/status/2030519243712626781 · Twitter Post