Is CVE-2021-29441 actively exploited?

Yes. CVE-2021-29441 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-29441 be exploited remotely?

The attack vector of CVE-2021-29441 has not been classified yet.

What is the CVSS score of CVE-2021-29441?

CVE-2021-29441 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-29441

UNKNOWNCISA KEVIN THE WILD

CVE-2021-29441

Published: April 11, 2026

EPSS:93.92%probability of exploitation in 30 daysPercentile:99.9th

Official 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.

NVD Source

Technical Analysis

CVE-2021-29441 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-29441 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.