CVE-2026-6239 Details
Description
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.
A stack-based buffer overflow vulnerability has been identified in the Tapo C520WS v2, specifically within the ONVIF CreateUsers service. The vulnerability arises because the device does not properly validate the number of XML user nodes in incoming requests. An authenticated attacker can exploit this by sending a crafted ONVIF request with an excessive number of user entries, leading to memory corruption. Successful exploitation may cause the ONVIF management service to crash, creating a denial-of-service condition that disrupts device configuration and management functions.
Users are advised to update the device to the latest firmware version. The updated firmware can be downloaded from the TP-Link website, either from the US or the international support page.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 6, 2026CISA-ADP
Assessed Jun 8, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes | TPLink | ProductRelease NotesVendor |
| https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes | TPLink | ProductRelease NotesVendor |
| https://www.tp-link.com/us/support/faq/5120/ | TPLink | AdvisoryBundleRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-121 | Stack-based Buffer Overflow | TPLink |
Affected Products
| Product | Versions |
|---|---|
| TP-Link Tapo C520WS | < 1.2.6 Build 260528 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | TPLink |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 6, 2026 | New CVE Received | TPLink |