CVE-2021-43797
moderate-risk
Published 2021-12-09
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.
Do I need to act?
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0.38% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10
Medium
NETWORK
/ LOW complexity
Affected Products (20)
Banking Party Management
Communications Design Studio
Helidon
Helidon
References (14)
Third Party Advisory
https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220107-0003/
Third Party Advisory
https://www.debian.org/security/2023/dsa-5316
Third Party Advisory
https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220107-0003/
Third Party Advisory
https://www.debian.org/security/2023/dsa-5316
45
/ 100
moderate-risk
Severity
24/34 · High
Exploitability
1/34 · Minimal
Exposure
20/34 · Moderate