Buffer overflow in Siemens APOGEE MBC
Priority MEDIUM 55CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
A vulnerability has been identified in APOGEE MBC (PPC) (P2 Ethernet) (All versions >= V2.6.3), APOGEE MEC (PPC) (P2 Ethernet) (All versions >= V2.6.3), APOGEE PXC Compact (BACnet) (All versions < V3.5.3), APOGEE PXC Compact (P2 Ethernet) (All versions >= V2.8), APOGEE PXC Modular (BACnet) (All versions < V3.5.3), APOGEE PXC Modular (P2 Ethernet) (All versions >= V2.8), TALON TC Compact (BACnet) (All versions < V3.5.3), TALON TC Modular (BACnet) (All versions < V3.5.3). The web server of affected devices lacks proper bounds checking when parsing the Host parameter in HTTP requests, which could lead to a buffer overflow. An unauthenticated remote attacker could exploit this vulnerability to execute arbitrary code on the device with root privileges.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03369 88th percentileScored 2026-11-07
Fix Fixed APOGEE PXC Compact (BACnet) (Siemens): V3.5.3APOGEE PXC Modular (BACnet) (Siemens): V3.5.3+2 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
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 MBC (PPC) (P2 Ethernet) | All versions >= V2.6.3 | — | No fix listed | CNA |
| Siemens | APOGEE MEC (PPC) (P2 Ethernet) | All versions >= V2.6.3 | — | No fix listed | CNA |
| Siemens | APOGEE PXC Compact (BACnet) | before V3.5.3 | V3.5.3 | Patch available | CNA |
| Siemens | APOGEE PXC Compact (P2 Ethernet) | All versions >= V2.8 | — | No fix listed | CNA |
| Siemens | APOGEE PXC Modular (BACnet) | before V3.5.3 | V3.5.3 | Patch available | CNA |
| Siemens | APOGEE PXC Modular (P2 Ethernet) | All versions >= V2.8 | — | No fix listed | CNA |
| Siemens | TALON TC Compact (BACnet) | before V3.5.3 | V3.5.3 | Patch available | CNA |
| Siemens | TALON TC Modular (BACnet) | before V3.5.3 | V3.5.3 | Patch available | CNA |
- APOGEE MBC (PPC) (P2 Ethernet) VendorSiemens Affected All versions >= V2.6.3 Fixed in — No fix listed CNA
- APOGEE MEC (PPC) (P2 Ethernet) VendorSiemens Affected All versions >= V2.6.3 Fixed in — No fix listed CNA
- APOGEE PXC Compact (BACnet) VendorSiemens Affected before V3.5.3 Fixed in V3.5.3 Patch available CNA
- APOGEE PXC Compact (P2 Ethernet) VendorSiemens Affected All versions >= V2.8 Fixed in — No fix listed CNA
- APOGEE PXC Modular (BACnet) VendorSiemens Affected before V3.5.3 Fixed in V3.5.3 Patch available CNA
- APOGEE PXC Modular (P2 Ethernet) VendorSiemens Affected All versions >= V2.8 Fixed in — No fix listed CNA
- TALON TC Compact (BACnet) VendorSiemens Affected before V3.5.3 Fixed in V3.5.3 Patch available CNA
- TALON TC Modular (BACnet) VendorSiemens Affected before V3.5.3 Fixed in V3.5.3 Patch available CNA
CPE configurations NVD · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:apogee_mbc_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* | up to 2.6.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_mbc_\(ppc\)_\(p2_ethernet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
| cpe:2.3:o:siemens:apogee_mec_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* | up to 2.6.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_mec_\(ppc\)_\(p2_ethernet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
| cpe:2.3:o:siemens:apogee_pxc_bacnet_automation_controller_firmware:*:*:*:*:*:*:*:* | before 3.5.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_pxc_bacnet_automation_controller:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:apogee_pxc_compact_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* | up to 2.8 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_pxc_compact_\(p2_ethernet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
| cpe:2.3:o:siemens:apogee_pxc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:* | before 3.5.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_pxc_modular_\(bacnet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
- cpe:2.3:o:siemens:apogee_mbc_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* Versions up to 2.6.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_mbc_\(ppc\)_\(p2_ethernet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
- cpe:2.3:o:siemens:apogee_mec_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* Versions up to 2.6.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_mec_\(ppc\)_\(p2_ethernet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
- cpe:2.3:o:siemens:apogee_pxc_bacnet_automation_controller_firmware:*:*:*:*:*:*:*:* Versions before 3.5.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_pxc_bacnet_automation_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:apogee_pxc_compact_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* Versions up to 2.8 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_pxc_compact_\(p2_ethernet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
- cpe:2.3:o:siemens:apogee_pxc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:* Versions before 3.5.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_pxc_modular_\(bacnet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:apogee_pxc_modular_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* | up to 2.8 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:apogee_pxc_modular_\(p2_ethernet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
| cpe:2.3:o:siemens:talon_tc_compact_\(bacnet\)_firmware:*:*:*:*:*:*:*:* | before 3.5.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:talon_tc_compact_\(bacnet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
| cpe:2.3:o:siemens:talon_tc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:* | before 3.5.3 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:talon_tc_modular_\(bacnet\):*:*:*:*:*:*:*:* | all versions | Running on | Siemens |
- cpe:2.3:o:siemens:apogee_pxc_modular_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:* Versions up to 2.8 Vulnerable ·Siemens
- cpe:2.3:h:siemens:apogee_pxc_modular_\(p2_ethernet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
- cpe:2.3:o:siemens:talon_tc_compact_\(bacnet\)_firmware:*:*:*:*:*:*:*:* Versions before 3.5.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:talon_tc_compact_\(bacnet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
- cpe:2.3:o:siemens:talon_tc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:* Versions before 3.5.3 Vulnerable ·Siemens
- cpe:2.3:h:siemens:talon_tc_modular_\(bacnet\):*:*:*:*:*:*:*:* Versions all versions Running on ·Siemens
Remediation
- Fix · CNA APOGEE PXC Compact (BACnet) (Siemens) Fixed in V3.5.3
- Fix · CNA APOGEE PXC Modular (BACnet) (Siemens) Fixed in V3.5.3
- Fix · CNA TALON TC Compact (BACnet) (Siemens) Fixed in V3.5.3
- Fix · CNA TALON TC Modular (BACnet) (Siemens) Fixed in V3.5.3
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27391
- 2026-10-03 Alias added: GHSA-98pm-v23p-r2wf
References
Sources
- CVE-2021-27391 · CVE Program
- CVE-2021-27391 · NVD
- FIRST EPSS
- GHSA-98pm-v23p-r2wf · GitHub Advisory Database · CC BY 4.0
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