What is CVE-2021-29441?

CVE-2021-29441 is a vulnerability in the Nacos platform that allows unauthorized access when authentication is enabled.

How severe is CVE-2021-29441?

CVE-2021-29441 has a severity rating of 9.8 (critical).

What is the affected software for CVE-2021-29441?

The affected software for CVE-2021-29441 is Nacos version 1.4.1.

How can I fix CVE-2021-29441?

To fix CVE-2021-29441, update your Nacos installation to version 1.4.1 or higher.

Where can I find more information about CVE-2021-29441?

You can find more information about CVE-2021-29441 at the following references: [NVD](https://nvd.nist.gov/vuln/detail/CVE-2021-29441), [GitHub issue](https://github.com/alibaba/nacos/issues/4701), [GitHub pull request](https://github.com/alibaba/nacos/pull/4703).

Vulnerability/
CVE-2021-29441

critical

9.8

CWE

290

27/4/2021

3/8/2024

CVE-2021-29441: Authentication bypass

First published: Tue Apr 27 2021(Updated: )

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.

Credit: security-advisories@github.com security-advisories@github.com

Affected Software	Affected Version	How to fix
maven/com.alibaba.nacos:nacos-common	<1.4.1	1.4.1
Alibaba Nacos	<1.4.1

Remedy

https://github.com/alibaba/nacos/pull/4703

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Reference Links

Frequently Asked Questions

What is CVE-2021-29441?
CVE-2021-29441 is a vulnerability in the Nacos platform that allows unauthorized access when authentication is enabled.
How severe is CVE-2021-29441?
CVE-2021-29441 has a severity rating of 9.8 (critical).
What is the affected software for CVE-2021-29441?
The affected software for CVE-2021-29441 is Nacos version 1.4.1.
How can I fix CVE-2021-29441?
To fix CVE-2021-29441, update your Nacos installation to version 1.4.1 or higher.
Where can I find more information about CVE-2021-29441?
You can find more information about CVE-2021-29441 at the following references: [NVD](https://nvd.nist.gov/vuln/detail/CVE-2021-29441), [GitHub issue](https://github.com/alibaba/nacos/issues/4701), [GitHub pull request](https://github.com/alibaba/nacos/pull/4703).

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