CVE-2020-28388

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 1.6%, top 27% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: cna:siemens, epss, ghsa
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.5
EG Score
6.5(medium)
EG Risk
—
EPSS
72.6%
KEV
Not listed

Published

February 9, 2021

Last Modified

June 2, 2026

References (4)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:38 UTCEG score recompute▲ 1.20
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  5. 2026-07-20 17:04 UTCEPSS rescore
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  11. 2026-07-16 16:59 UTCEPSS rescore
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  1. 2026-07-06 16:25 UTCEPSS rescore
  2. 2026-07-06 02:21 UTCEPSS rescore
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  6. 2026-06-30 23:20 UTCEPSS rescore
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  8. 2026-06-28 04:54 UTCEPSS rescore
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  10. 2026-06-27 03:06 UTCEPSS rescore
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  12. 2026-06-25 13:48 UTCEPSS rescore
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  15. 2026-06-23 21:31 UTCEPSS rescore
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  17. 2026-06-22 14:23 UTCEPSS rescore
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  19. 2026-06-21 14:54 UTCEPSS rescore
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  21. 2026-06-21 01:57 UTCEPSS rescore
  22. 2026-06-19 19:24 UTCEPSS rescore
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  24. 2026-06-18 17:50 UTCEPSS rescore
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  26. 2026-06-17 17:50 UTCEPSS rescore
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  29. 2026-06-14 23:15 UTCEPSS rescore
  30. 2026-06-13 22:58 UTCEPSS rescore
  31. 2026-06-12 23:10 UTCEPSS rescore
  32. 2026-06-11 13:58 UTCEPSS rescore
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  35. 2026-06-08 14:15 UTCEPSS rescore
  36. 2026-06-07 15:23 UTCEPSS rescore
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  39. 2026-06-06 13:46 UTCEPSS rescore
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  41. 2026-06-05 22:45 UTCEPSS rescore
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  43. 2026-06-05 06:08 UTCEPSS rescore
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  45. 2026-06-04 13:10 UTCEPSS rescore
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  47. 2026-06-02 20:11 UTCEPSS rescore
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  49. 2026-06-01 13:50 UTCEPSS rescore
  50. 2026-05-31 22:29 UTCEPSS rescore
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  52. 2026-05-31 00:15 UTCEPSS rescore
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  54. 2026-05-29 13:42 UTCEPSS rescore
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  57. 2026-05-27 13:39 UTCEPSS rescore
  58. 2026-05-27 13:39 UTCEPSS rescore
  59. 2026-05-26 21:03 UTCEG score recompute
  60. 2026-05-26 21:03 UTCGHSA enrichment
  61. 2026-05-26 13:42 UTCEPSS rescore
  62. 2026-05-26 13:42 UTCEPSS rescore
  63. 2026-05-26 07:17 UTCEPSS rescore
  64. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-28388?
CVE-2020-28388 is a medium vulnerability published on February 9, 2021. 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),…
When was CVE-2020-28388 disclosed?
CVE-2020-28388 was first published in the National Vulnerability Database on February 9, 2021, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-28388 actively exploited?
CVE-2020-28388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-28388?
CVE-2020-28388 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2020-28388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-28388, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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