CVE-2026-45673
Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
9th
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
| CWE | CWE-330 CWE-340 |
| Vendor | netty |
| Product | netty |
| Published | Jun 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
netty / netty
>= 4.2.0.Final, < 4.2.15.Final < 4.1.135.Final