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.

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
TP-Link Systems Inc. Tapo C520WS v2 unaffected
Version Status Constraints
0 affected < 1.2.6 Build 260528

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes cve-icon cve-icon
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes cve-icon cve-icon
https://www.tp-link.com/us/support/faq/5120/ cve-icon cve-icon
History

Sat, 06 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
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.
Title Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520WS
Weaknesses CWE-121
References
Metrics cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: TPLink

Published:

Updated: 2026-06-05T23:50:59.001Z

Reserved: 2026-04-13T17:10:22.074Z

Link: CVE-2026-6239

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-06T00:16:40.977

Modified: 2026-06-06T00:16:40.977

Link: CVE-2026-6239

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-06T01:30:06Z

Weaknesses