CVE-2026-3715: Wavlink Wl-wn579x3-c Firmware buffer overflow (CVSS 8.8)

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Wavlink Wl-wn579x3-c Firmware231124

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

https://dl.wavlink.com/firmware/RD/WN579X3C_WAVLINK_V20260226_WO_cb3003b2.binBroken Link
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_17/README.mdExploitThird Party Advisory
https://vuldb.com/?ctiid.349660Permissions RequiredVDB Entry
https://vuldb.com/?id.349660Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.765325Third Party AdvisoryVDB Entry

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-3715 being actively exploited?

CVE-2026-3715 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.05%.

How severe is CVE-2026-3715?

CVE-2026-3715 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.05% probability of exploitation.

Which products are affected by CVE-2026-3715?

Affected products include Wavlink Wl-wn579x3-c Firmware.

How do I fix CVE-2026-3715?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-3715 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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