PT-2026-28654 · Wavlink · Wavlink Wl-Nu516U1

Haimianbaobao + 1 · Published 2026-03-26 · Updated 2026-04-30 · CVE-2026-4861

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Wavlink WL-NU516U1 version 260227

Description A stack-based buffer overflow exists in the ftext function of the /cgi-bin/nas.cgi file in Wavlink WL-NU516U1. The issue is triggered by manipulating the Content-Length argument, allowing for remote exploitation. The exploit has been publicly released. The vendor was notified but did not respond.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Stack Overflow

Buffer Overflow

Weakness Enumeration

CWE-121

CWE-119

Related Identifiers

CVE-2026-4861

Affected Products

Wavlink Wl-Nu516U1

References · 8

• 🔥 https://github.com/Wlz1112/WAVLINK-NU516U1-V260227/blob/main/Content-Length.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-4861 · Security Note
• https://twitter.com/cyberbivash/status/2037126752833560802 · Twitter Post
• https://twitter.com/CveFindCom/status/2037102993355559012 · Twitter Post
• https://t.me/cveNotify/161592 · Telegram Post
• https://vuldb.com/?id.353192 · Note
• https://vuldb.com/?ctiid.353192 · Note
• https://vuldb.com/?submit.776217 · Note