A memory leak can be caused in Netty's DNS codec by sending malicious DNS packets containing invalid domain names. Because the leak occurs incrementally per packet, sustained malicious requests will cause a gradual Denial of Service.
| Field | Value | |——-|——-| | Product | Netty | | Version | 4.2.12.Final (and all prior versions with codec-dns) | | Component | io.netty.handler.codec.dns.DnsCodecUtil | | Vulnerability Type | CWE-20: Improper Input Validation / CWE-626: Null Byte Interaction Error / CWE-400: Uncontrolled Resource Consumption | | Impact | DNS Cache Poisoning / Domain Validation Bypass / Denial of Service / Malformed DNS Packets |