CVE-2026-6239

What it is

A stack‑based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive number of user entries to trigger memory corruption. Successful exploitation may cause the ONVIF management service to terminate unexpectedly, resulting in a denial‑of‑service (DoS) condition that disrupts device configuration and management functions.

At a glance

Exploitability

Can be exploited from the same network segment with an admin-level account. High risk of service disruption.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-06-06 00:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-23 07:10 UTC Last updatedMost recent change to the record

Details

Published

2026-06-06 00:16 UTC

Last modified

2026-07-23 07:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-121

Record status

Deferred

Attack profile CVSS 4.0 · 6.8

Attack vector

Adjacent network

Complexity

Low

Attack requirements

None

Privileges needed

High

User interaction

None

Confidentiality

None

Integrity

None

Availability

High