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Advisories

Netty 4.2.0 through 4.2.16 TLS Hostname Verification Bypass

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severity
high
date
Affecting

  • netty >= 4.2.0.Final, < 4.2.16.Final

  • netty >= 0, < 4.1.137.Final

CWE
  • CWE-297 Improper Validation of Certificate with Host Mismatch
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
violetagg
Description
Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java 25+). In this configuration the OpenSSL client does not perform hostname verification, allowing a man-in-the-middle attacker to present a certificate issued for a different hostname that is accepted without validation. Fixed in 4.2.17.Final and 4.1.137.Final.

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