Go to homepageCyberStrike

Menu

Star on GitHub · 3.3k
Sign inDownload

CVE-2021-43797

6.5 · MEDIUM

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

Published Dec 9, 2021CWE-444EPSS 2.88%

Overview

CVE-2021-43797 is a medium-severity vulnerability. It was published on December 9, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323GitHubgithub.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqqReflists.debian.org/debian-lts-announce/2023/01/msg00008.htmlRefsecurity.netapp.com/advisory/ntap-20220107-0003/Refwww.debian.org/security/2023/dsa-5316Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefwww.oracle.com/security-alerts/cpujul2022.htmlGitHubgithub.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323GitHubgithub.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqqReflists.debian.org/debian-lts-announce/2023/01/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43797?

CVE-2021-43797 is a medium-severity vulnerability. It was published on December 9, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-43797?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43797?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43797?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43797 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →