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 Source Code (Versions including affected DNS modules), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS domain name record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a write past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to execute code in the context of the current process or cause a denial-of-service condition.
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityHigh
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | cve.org | initial, patch: Unavailable | 8.2 |
Affected Software
| Vendor | Product | Version |
|---|
| Siemens | APOGEE PXC Compact (BACnet) | < 3.5.5 |
| Siemens | APOGEE PXC Compact (P2 Ethernet) | < 2.8.20 |
| Siemens | APOGEE PXC Modular (BACnet) | < 3.5.5 |
| Siemens | APOGEE PXC Modular (P2 Ethernet) | < 2.8.20 |
| Siemens | Nucleus NET | < 5.2 |
| Siemens | Nucleus Source Code | Versions including affected DNS modules |
| siemens | nucleus_net | < 5.2 |
| siemens | nucleus_source_code | All versions |
| Siemens | TALON TC Compact (BACnet) | < 3.5.5 |
| Siemens | TALON TC Modular (BACnet) | < 3.5.5 |
Published: 2021-04-22
