An authenticated format string vulnerability is present in the ONVIF AddScopes in Tapo C520WS v2, where user-controlled input is improperly passed to formatting functions without adequate sanitization. An attacker can inject format specifiers into ONVIF scope parameters to manipulate memory handling behavior.

Successful exploitation may cause the ONVIF management service to crash, resulting in DoS condition that impacts normal device operation.

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 An authenticated format string vulnerability is present in the ONVIF AddScopes in Tapo C520WS v2, where user-controlled input is improperly passed to formatting functions without adequate sanitization. An attacker can inject format specifiers into ONVIF scope parameters to manipulate memory handling behavior. Successful exploitation may cause the ONVIF management service to crash, resulting in DoS condition that impacts normal device operation.
Title Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
Weaknesses CWE-134
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: 2026-06-05T23:52:18.189Z

Reserved: 2026-04-13T17:10:26.104Z

Link: CVE-2026-6241

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-06T00:16:41.230

Modified: 2026-06-06T00:16:41.230

Link: CVE-2026-6241

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses