CVE-2021-29441 Scanner
Detects 'Authentication Bypass' vulnerability in nacos affects v. before 1.4.1.
Used 2.8k times · 3.4k assets checked · domain, ipv4, subdomain
CVE
CVE-2021-29441
8.6
CVSShigh
Exploitable remotely over the internet · no authentication required.
Description
Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.
Attack Vector
Network
Privileges Req.
None
User Interaction
None
nacos
Updated Oct 24, 2026View on NVD →
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CVE history: nacos
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