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CVE-2026-45673

Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port

Published: Jun 12, 2026Updated: Jun 15, 2026 Sources: CVE List NVDCWE-330
6.8MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 83.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-330CWE-340

Affected Products

netty
oss-projectaka netty-incubator-codec-ohttp, io.netty:netty
nettyLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
Scannable·OpenVAS
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Credential Access
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References

https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
github.com
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
github.com
https://github.com/netty/netty/security/advisories/GHSA-xmv7-r254-6q78
github.com
News mentions
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