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CVE-2026-6241— Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS

Quick assessment

Affected
TP-Link Systems Inc. Tapo C520WS v2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2版本存在安全漏洞，该漏洞源于ONVIF AddScopes中格式字符串漏洞，用户控制的输入未充分清理即传递给格式化函数，可能导致经过身份验证的攻击者注入格式说明符，造成拒绝服务。

AI Predicted 5.9 Difficulty: Easy EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
TP-Link Systems Inc. Tapo C520WS v2 < 1.2.6 Build 260528 affected
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I. Basic Information for CVE-2026-6241

Vulnerability Information
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Vulnerability Title
Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部控制的格式字符串
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link Tapo C520WS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2版本存在安全漏洞，该漏洞源于ONVIF AddScopes中格式字符串漏洞，用户控制的输入未充分清理即传递给格式化函数，可能导致经过身份验证的攻击者注入格式说明符，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TP-Link Systems Inc. Tapo C520WS v2 0 ~ 1.2.6 Build 260528 -

II. Public POCs for CVE-2026-6241

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III. Intelligence Information for CVE-2026-6241

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Vendor Advisories for CVE-2026-6241 (1)

Same Patch Batch · TP-Link Systems Inc. · 2026-06-05 · 6 CVEs total

CVE-2026-6240 Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C52
CVE-2026-6239 Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520
CVE-2026-6242 Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520W
CVE-2026-34123 Whitelist Validation Bypass in TP-Link Tapo C520WS
CVE-2026-8714 Denial-of-Service Vulnerability in RTSP Input Handling on TP-Link's Tapo C520WS

IV. Related Vulnerabilities

Same product: Tapo C520WS v2
Same vendor: TP-Link Systems Inc.
Same weakness: CWE-134

V. Comments for CVE-2026-6241

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