---
cve: "CVE-2020-28388"
severity: "MEDIUM"
cvss: 6.5
epss: "1.4%"
vendor: "Siemens"
kev: false
exploited: false
published: "2021-02-09 18:15:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T04:11:40+02:00"
---

# CVE-2020-28388

> 6.5 MEDIUM

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Referenzen

- <https://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdf>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdf>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-436469.pdf>
- <https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2020-28388) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_