A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a crafted malicious request containing an excessive number of identifiers to overflow stack memory.

Successful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.

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

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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 DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a crafted malicious request containing an excessive number of identifiers to overflow stack memory. Successful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.
Title Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo 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: 2026-06-05T23:51:39.483Z

Reserved: 2026-04-13T17:10:23.938Z

Link: CVE-2026-6240

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-06T00:16:41.103

Modified: 2026-06-06T00:16:41.103

Link: CVE-2026-6240

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses