CVE-2021-25677: Medium severity siemens simotics connect 400 vulnerability
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V3 (All versions < V2017.02.4), 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), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID is CVE-2021-25677.
What is the severity level of CVE-2021-25677?
The severity level of CVE-2021-25677 is medium (5.3).
Which software versions are affected by CVE-2021-25677?
APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (Up to version 2017.02.4), Nucleus ReadyStart V4 (Up to version 4.1.0), and Siemens Simotics Connect 400 Firmware (Version >= 0.5.0.0) are affected by CVE-2021-25677.
How can I fix the vulnerability CVE-2021-25677?
There is currently no known fix or patch available for CVE-2021-25677. It is recommended to follow the mitigation steps provided by Siemens.
Where can I find more information about CVE-2021-25677?
You can find more information about CVE-2021-25677 in the following references: - [SSA-180579](https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf) - [SSA-669158](https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf) - [SSA-705111](https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf)