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Description

A vulnerability was found in Wavlink WL-WN579X3-C 231124. This affects the function sub_40139C of the file /cgi-bin/firewall.cgi. Performing a manipulation of the argument del_flag results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could be used. Upgrading to version 20260226 is able to mitigate this issue. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

PUBLISHED Reserved 2026-03-07 | Published 2026-03-08 | Updated 2026-03-08 | 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:O/RC:C
HIGH: 8.8CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
9.0AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:OF/RC:C

Problem types

Stack-based Buffer Overflow

Memory Corruption

Product status

231124
affected

20260226
unaffected

Timeline

2026-03-07:Advisory disclosed
2026-03-07:VulDB entry created
2026-03-07:VulDB entry last update

Credits

LtzHuster (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.349660 (VDB-349660 | Wavlink WL-WN579X3-C firewall.cgi sub_40139C stack-based overflow) vdb-entry technical-description

vuldb.com/?ctiid.349660 (VDB-349660 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.765325 (Submit #765325 | Wavlink WL-WN579X3-C V231124 Stack-based Buffer Overflow) third-party-advisory

github.com/...vul_db/blob/main/WL-WN579X3-C/vul_17/README.md exploit

dl.wavlink.com/...WN579X3C_WAVLINK_V20260226_WO_cb3003b2.bin patch

cve.org (CVE-2026-3715)

nvd.nist.gov (CVE-2026-3715)

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