CVE-2021-29441
HIGH EXPLOITED IN THE WILD NUCLEIAlibaba Nacos < 1.4.1 - Authentication Bypass by Spoofing
Title source: ruleDescription
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.
Exploits (4)
Nuclei Templates (1)
Nacos <1.4.1 - Authentication Bypass
CRITICALby dwisiswant0
Scores
CVSS v3
8.6
EPSS
0.9392
EPSS Percentile
99.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Details
VulnCheck KEV
2023-12-01
InTheWild.io
2021-04-12
CWE
CWE-290
Status
published
Products (2)
alibaba/nacos
< 1.4.1
com.alibaba.nacos/nacos-common
0 - 1.4.1Maven
Published
Apr 27, 2021
Tracked Since
Feb 18, 2026