Improper input validation in Netty - CVE-2021-37137
Published: January 23, 2022 / Updated: May 5, 2026
Vulnerability identifier: #VU59924
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-37137
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Netty project
Affected software:
Netty
Netty
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within the Snappy frame decoder function. A remote attacker can send specially crafted HTTP requests and perform a denial of service attack.
How to mitigate CVE-2021-37137
Install updates from vendor's website.