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High severity8.6NVD Advisory· Published Apr 27, 2021· Updated Jun 17, 2026

CVE-2021-29441

CVE-2021-29441

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
com.alibaba.nacos:nacos-commonMaven
< 1.4.11.4.1

Affected products

3

Patches

Vulnerability mechanics

References

4

News mentions

9