CVE-2021-27393

MEDIUM

Nucleus NET, ReadyStart V3 <V2013.08, Source Code - Info Disclosure

Title source: llm

Description

A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.

References (1)

[Vendor Advisory] https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf

Scores

CVSS v3 5.3

EPSS 0.0022

EPSS Percentile 44.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Details

CWE

CWE-330

Status published

Products (3)

siemens/nucleus_net

siemens/nucleus_readystart_v3 < 2013.08

siemens/nucleus_source_code

Published Apr 22, 2021

Tracked Since Feb 18, 2026