CVE-2020-28388

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 < V5.2), Nucleus ReadyStart V3 (All versions < V2012.12), Nucleus Source Code (All versions), PLUSCONTROL 1st Gen (All versions), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). Initial Sequence Numbers (ISNs) for TCP connections are derived from an insufficiently random source. As a result, the ISN of current and future TCP connections could be predictable. An attacker could hijack existing sessions or spoof future ones.

• CWE-342

• https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdfVendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdfVendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-436469.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdfVendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdfVendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-436469.pdf

Published

Feb 9, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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