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Description

A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

PUBLISHED Reserved 2026-03-25 | Published 2026-03-26 | Updated 2026-03-26 | Assigner VulDB




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
HIGH: 8.8CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.0AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Problem types

Stack-based Buffer Overflow

Memory Corruption

Product status

260227
affected

Timeline

2026-03-25:Advisory disclosed
2026-03-25:VulDB entry created
2026-03-25:VulDB entry last update

Credits

haimianbaobao (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.353192 (VDB-353192 | Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow) vdb-entry technical-description

vuldb.com/?ctiid.353192 (VDB-353192 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.776217 (Submit #776217 | Wavlink NU516U1 V260227 Stack-based Buffer Overflow) third-party-advisory

github.com/...NK-NU516U1-V260227/blob/main/Content-Length.md exploit

cve.org (CVE-2026-4861)

nvd.nist.gov (CVE-2026-4861)

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