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CVE-2021-43797

MEDIUMCVSS 6.5/10EPSS 2.68%

Last modified

CVE-2021-43797 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 2.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability
2.68%

83.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
NettyNetty< 4.1.71
QuarkusQuarkus< 2.5.3
NetappOncommand Workflow AutomationAll versions
NetappSnapcenterAll versions
OracleBanking Deposits And Lines Of Credit Servicing2.7
OracleBanking Party Management2.7.0
OracleBanking Platform2.6.2
OracleCoherence12.2.1.4.0
OracleCoherence14.1.1.0.0
OracleCommunications Cloud Native Core Binding Support Function1.11.0
OracleCommunications Cloud Native Core Network Slice Selection Function1.8.0
OracleCommunications Cloud Native Core Policy1.15.0
OracleCommunications Cloud Native Core Security Edge Protection Proxy1.7.0
OracleCommunications Cloud Native Core Unified Data Repository1.15.0
OracleCommunications Design Studio7.4.2
OracleCommunications Instant Messaging Server8.1
OracleHelidon1.4.10
OracleHelidon2.4.0
OraclePeoplesoft Enterprise Peopletools8.58
OraclePeoplesoft Enterprise Peopletools8.59
DebianDebian Linux10.0
DebianDebian Linux11.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-43797?
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.
How severe is CVE-2021-43797?
CVE-2021-43797 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.68% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43797?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43797?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST