CVE-2021-25677 Information

Description

A vulnerability has been identified in Nucleus NET (All versions) Nucleus ReadyStart V3 (All versions < V2017.02.3) Nucleus ReadyStart V4 (All versions < V4.1.0) Nucleus Source Code (Versions including affected DNS modules) SIMOTICS CONNECT 400 (All versions < V0.5.0.0) SIMOTICS CONNECT 400 (All versions >= V0.5.0.0 < V1.0.0.0). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.

CVSS Vector

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

Reference

https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3