CVE-2026-34121— Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
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I. Basic Information for CVE-2026-34121
Vulnerability Information
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Vulnerability Title
Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
Source: NVD (National Vulnerability Database)
Vulnerability Description
An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
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 v2.6版本存在安全漏洞，该漏洞源于DS配置服务的HTTP处理中身份验证检查期间JSON请求的解析和授权逻辑不一致，可能导致身份验证绕过，进而未经授权修改设备状态。
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 v2.6 | 0 ~ 1.2.4 Build 260326 Rel.24666n | - |
II. Public POCs for CVE-2026-34121
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Same Patch Batch · TP-Link Systems Inc. · 2026-04-02 · 6 CVEs total
| CVE-2026-34119 | Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520 | |
| CVE-2026-34124 | Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WS | |
| CVE-2026-34122 | Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS | |
| CVE-2026-34120 | Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520 | |
| CVE-2026-34118 | Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520 |
IV. Related Vulnerabilities
Same product: Tapo C520WS v2.6
- CVE-2026-34124
Denial of Service via Path Expansion Overflow in HTTP Servic - CVE-2026-34122
Stack-based Buffer Overflow Leading to Denial of Service in - CVE-2026-34120
Heap-based Buffer Overflow Vulnerability Leading to Denial-o - CVE-2026-34119
Heap-based Buffer Overflow Vulnerability Leading to Denial-o - CVE-2026-34118
Heap-based Buffer Overflow Vulnerability Leading to Denial-o
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V. Comments for CVE-2026-34121
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