Vulnerability · Published Mar 8, 2026 · Assigned by VulDB

CVE-2026-3715Wavlink WL-WN579X3-C firewall.cgi sub_40139C stack-based overflow

High 8.8

In plain English

A high-severity stack buffer overflow in WL-WN579X3-C from Wavlink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 45.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Wavlink	WL-WN579X3-C	231124

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

References

VDB-349660 | Wavlink WL-WN579X3-C firewall.cgi sub_40139C stack-based overflow vdb-entry, technical-description
VDB-349660 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #765325 | Wavlink WL-WN579X3-C V231124 Stack-based Buffer Overflow third-party-advisory
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_17/README.md exploit
https://dl.wavlink.com/firmware/RD/WN579X3C_WAVLINK_V20260226_WO_cb3003b2.bin patch