A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions <…
Priority LOW 38CWE-342Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01367 72nd percentileScored 2026-11-07
Fix Fixed APOGEE PXC Compact (BACnet) (Siemens): V3.5.5APOGEE PXC Compact (P2 Ethernet) (Siemens): V2.8.20+6 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Siemens | APOGEE PXC Compact (BACnet) | before V3.5.5 | V3.5.5 | Patch available | CNA |
| Siemens | APOGEE PXC Compact (P2 Ethernet) | before V2.8.20 | V2.8.20 | Patch available | CNA |
| Siemens | APOGEE PXC Modular (BACnet) | before V3.5.5 | V3.5.5 | Patch available | CNA |
| Siemens | APOGEE PXC Modular (P2 Ethernet) | before V2.8.20 | V2.8.20 | Patch available | CNA |
| Siemens | Nucleus NET | before V5.2 | V5.2 | Patch available | CNA |
| Siemens | Nucleus ReadyStart V3 | before V2012.12 | V2012.12 | Patch available | CNA |
| Siemens | Nucleus Source Code | All versions | — | No fix listed | CNA |
| Siemens | PLUSCONTROL 1st Gen | All versions | — | No fix listed | CNA |
| Siemens | TALON TC Compact (BACnet) | before V3.5.5 | V3.5.5 | Patch available | CNA |
| Siemens | TALON TC Modular (BACnet) | before V3.5.5 | V3.5.5 | Patch available | CNA |
- APOGEE PXC Compact (BACnet) VendorSiemens Affected before V3.5.5 Fixed in V3.5.5 Patch available CNA
- APOGEE PXC Compact (P2 Ethernet) VendorSiemens Affected before V2.8.20 Fixed in V2.8.20 Patch available CNA
- APOGEE PXC Modular (BACnet) VendorSiemens Affected before V3.5.5 Fixed in V3.5.5 Patch available CNA
- APOGEE PXC Modular (P2 Ethernet) VendorSiemens Affected before V2.8.20 Fixed in V2.8.20 Patch available CNA
- Nucleus NET VendorSiemens Affected before V5.2 Fixed in V5.2 Patch available CNA
- Nucleus ReadyStart V3 VendorSiemens Affected before V2012.12 Fixed in V2012.12 Patch available CNA
- Nucleus Source Code VendorSiemens Affected All versions Fixed in — No fix listed CNA
- PLUSCONTROL 1st Gen VendorSiemens Affected All versions Fixed in — No fix listed CNA
- TALON TC Compact (BACnet) VendorSiemens Affected before V3.5.5 Fixed in V3.5.5 Patch available CNA
- TALON TC Modular (BACnet) VendorSiemens Affected before V3.5.5 Fixed in V3.5.5 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:siemens:capital_vstar:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* | before 5.2 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_source_code:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:a:siemens:pluscontrol_1st_gen:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* | before 2012.12 | Vulnerable | Siemens |
| cpe:2.3:h:arm:arm:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Arm |
| cpe:2.3:h:mips:mips:-:*:*:*:*:*:*:* | not specified by NVD | Running on | — |
| cpe:2.3:h:powerpc_project:powerpc:-:*:*:*:*:*:*:* | not specified by NVD | Running on | — |
- cpe:2.3:a:siemens:capital_vstar:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* Versions before 5.2 Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_source_code:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:a:siemens:pluscontrol_1st_gen:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* Versions before 2012.12 Vulnerable ·Siemens
- cpe:2.3:h:arm:arm:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Arm
- cpe:2.3:h:mips:mips:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·—
- cpe:2.3:h:powerpc_project:powerpc:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·—
Remediation
- Fix · CNA APOGEE PXC Compact (BACnet) (Siemens) Fixed in V3.5.5
- Fix · CNA APOGEE PXC Compact (P2 Ethernet) (Siemens) Fixed in V2.8.20
- Fix · CNA APOGEE PXC Modular (BACnet) (Siemens) Fixed in V3.5.5
- Fix · CNA APOGEE PXC Modular (P2 Ethernet) (Siemens) Fixed in V2.8.20
- Fix · CNA Nucleus NET (Siemens) Fixed in V5.2
- Fix · CNA Nucleus ReadyStart V3 (Siemens) Fixed in V2012.12
- Fix · CNA TALON TC Compact (BACnet) (Siemens) Fixed in V3.5.5
- Fix · CNA TALON TC Modular (BACnet) (Siemens) Fixed in V3.5.5
Timeline
- 2026-10-02 Threatist record created from CVE-2020-28388
- 2026-10-03 Alias added: GHSA-j6gp-g45q-2wm2
References
More Siemens Capital Vstar vulnerabilities
- TI-2021-11873 A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE… CVSS 3.1CRITICAL 9.8
- TI-2021-11879 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All… CVSS 3.1CRITICAL 9.1
- TI-2021-11878 Integer underflow in Siemens Capital Embedded AR Classic 431-422 CVSS 3.1CRITICAL 9.1
- TI-2021-11490 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All… CVSS 3.1CRITICAL 9.1
- TI-2021-11489 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All… CVSS 3.1CRITICAL 9.1
- TI-2021-07796 Infinite loop in Siemens Capital Embedded AR Classic 431-422 CVSS 4.0HIGH 8.7
Sources
- CVE-2020-28388 · CVE Program
- CVE-2020-28388 · NVD
- FIRST EPSS
- GHSA-j6gp-g45q-2wm2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences