HOMEVULNERABILITIESCVE-2020-28388
MEDIUM

CVE-2020-28388

CWE-342Published: February 9, 2021· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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 < 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.

NVD Source

Technical Analysis

CVE-2020-28388 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

arm1 product(s)
arm
mips1 product(s)
mips
powerpc_project1 product(s)
powerpc
siemens5 product(s)
capital vstarnucleus netnucleus source codepluscontrol 1st gennucleus readystart
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdf
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdf

All References (8)

→
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

Quick Facts

CVE IDCVE-2020-28388
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-342
CISA KEVNo
Affected4 vendor(s)
PublishedFeb 9, 2021

Related CVEs (CWE-342)

CVE-2020-16226
9.8
CVE-2023-3373
9.1
CVE-2022-27577
9.1
CVE-2014-9196
7.6
CVE-2022-29930
4.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-28388 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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