Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Simotics Connect 400 Firmware | >= 0.5.0.0 |
| Siemens | Simotics Connect 400 | - |
| Siemens | Nucleus Net | All versions |
| Siemens | Nucleus Readystart V3 | < 2017.02.4 |
| Siemens | Nucleus Readystart V4 | < 4.1.0 |
| Siemens | Nucleus Source Code | - |
Related Weaknesses (CWE)
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdfPatchVendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdfPatchVendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdfPatchVendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdfPatchVendor Advisory
FAQ
What is CVE-2021-25677?
CVE-2021-25677 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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....
How severe is CVE-2021-25677?
CVE-2021-25677 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-25677?
Check the references section above for vendor advisories and patch information. Affected products include: Siemens Simotics Connect 400 Firmware, Siemens Simotics Connect 400, Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Readystart V4.