Out-of-bounds read in Siemens APOGEE PXC Compact
Priority LOW 35CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · High
- 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), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS response parsing functionality does not properly validate various length and counts of the records. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the memory past the allocated structure.
Why it matters now
EPSS 0.03572 89th percentileScored 2026-11-07
Fix Fixed APOGEE PXC Compact (BACnet) (Siemens): V3.5.5APOGEE PXC Compact (P2 Ethernet) (Siemens): V2.8.20+7 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
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 | All versions | — | No fix listed | CNA |
| Siemens | Nucleus ReadyStart V3 | before V2017.02.3 | V2017.02.3 | Patch available | CNA |
| Siemens | Nucleus ReadyStart V4 | before V4.1.0 | V4.1.0 | Patch available | CNA |
| Siemens | Nucleus Source Code | Versions including affected DNS modules | — | No fix listed | CNA |
| Siemens | SIMOTICS CONNECT 400 | before V0.5.0.0 | V0.5.0.0 | Patch available | 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 All versions Fixed in — No fix listed CNA
- Nucleus ReadyStart V3 VendorSiemens Affected before V2017.02.3 Fixed in V2017.02.3 Patch available CNA
- Nucleus ReadyStart V4 VendorSiemens Affected before V4.1.0 Fixed in V4.1.0 Patch available CNA
- Nucleus Source Code VendorSiemens Affected Versions including affected DNS modules Fixed in — No fix listed CNA
- SIMOTICS CONNECT 400 VendorSiemens Affected before V0.5.0.0 Fixed in V0.5.0.0 Patch available 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 · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:simotics_connect_400_firmware:*:*:*:*:*:*:*:* | before 0.5.0.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:simotics_connect_400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* | all versions | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:* | before 2017.02.3 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_readystart_v4:*:*:*:*:*:*:*:* | before 4.1.0 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Siemens |
- cpe:2.3:o:siemens:simotics_connect_400_firmware:*:*:*:*:*:*:*:* Versions before 0.5.0.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:simotics_connect_400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:* Versions before 2017.02.3 Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_readystart_v4:*:*:*:*:*:*:*:* Versions before 4.1.0 Vulnerable ·Siemens
- cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Siemens
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 ReadyStart V3 (Siemens) Fixed in V2017.02.3
- Fix · CNA Nucleus ReadyStart V4 (Siemens) Fixed in V4.1.0
- Fix · CNA SIMOTICS CONNECT 400 (Siemens) Fixed in V0.5.0.0
- 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-2020-27737
- 2026-10-03 Alias added: GHSA-j94w-w786-mv9m
References
More Siemens Nucleus Net vulnerabilities
- TI-2021-11875 Out-of-bounds write in Siemens APOGEE MBC CVSS 3.1CRITICAL 9.8
- TI-2022-17998 Uncontrolled resource consumption in Siemens APOGEE MBC CVSS 4.0HIGH 8.7
- TI-2021-11873 A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE… CVSS 3.1CRITICAL 9.8
- TI-2020-16432 Out-of-bounds write in Siemens APOGEE PXC Compact CVSS 3.1HIGH 8.1
- TI-2020-12430 Out-of-bounds write in Siemens APOGEE PXC Compact CVSS 3.1HIGH 8.1
- TI-2021-11879 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All… CVSS 3.1CRITICAL 9.1
Sources
- CVE-2020-27737 · CVE Program
- CVE-2020-27737 · NVD
- FIRST EPSS
- GHSA-j94w-w786-mv9m · 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