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CVE-2026-6239— Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao 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 CreateUsers服务中栈缓冲区溢出，设备未能正确验证XML用户节点数量，可能导致经过身份验证的攻击者发送特制请求触发内存损坏，造成拒绝服务。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-6239

Vulnerability Information
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Vulnerability Title
Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520WS
Source: CVE Program / CVE List V5
Vulnerability 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.
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
栈缓冲区溢出
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 CreateUsers服务中栈缓冲区溢出，设备未能正确验证XML用户节点数量，可能导致经过身份验证的攻击者发送特制请求触发内存损坏，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-2026-6239

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III. Intelligence Information for CVE-2026-6239

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Vendor Advisories for CVE-2026-6239 (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-2026-6241 Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
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-121

V. Comments for CVE-2026-6239

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