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…
- Published
- Updated
- Reserved
- Assigned by
- siemens
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.
Timeline
ID reserved
By siemens
- 3 months later
· 3 months later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| siemensCNA (assigner) | 3.1 | Medium6.5 | 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 |
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 1.4% · top 28% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
Siemens · APOGEE PXC Compact (BACnet)
- affected All versions < V3.5.5
Siemens · APOGEE PXC Compact (P2 Ethernet)
- affected All versions < V2.8.20
Siemens · APOGEE PXC Modular (BACnet)
- affected All versions < V3.5.5
Siemens · APOGEE PXC Modular (P2 Ethernet)
- affected All versions < V2.8.20
- affected All versions < V5.2
Siemens · Nucleus ReadyStart V3
- affected All versions < V2012.12
- affected All versions
- affected All versions
Siemens · TALON TC Compact (BACnet)
- affected All versions < V3.5.5
Siemens · TALON TC Modular (BACnet)
- affected All versions < V3.5.5
References (4)
- https://cert-portal.siemens.com/productcert/pdf/ssa-362164.pdf (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-344238.pdf (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-436469.pdf (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-28388)Record last updated .