---
cve: "CVE-2026-45673"
severity: "MEDIUM"
cvss: 6.8
epss: "26%"
vendor: "netty"
kev: false
exploited: false
published: "2026-06-12 15:16:27"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T21:52:01+02:00"
---

# CVE-2026-45673

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- f05f765d81460799c53123a207f665bf3b465171 (Commit)
- a41f7b289ce1d697c50846f3ade3983e22b2ed40 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45673) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_