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CVE-2021-27391

Severity
CRITICAL
CVSS
9.8
EPSS
0.03369
Risk score
40.38
CISA KEV
No
PoC
No
Published
2021-09-14
Modified
2025-04-23
First seen
2026-08-07
Aliases
EUVD-2021-14146, GHSA-98PM-V23P-R2WF
Products
Siemens:APOGEE MBC (PPC) (P2 Ethernet) All versions V2.6.3, Siemens:APOGEE MEC (PPC) (P2 Ethernet) All versions V2.6.3, Siemens:APOGEE PXC Compact (BACnet) All versions < V3.5.3, Siemens:APOGEE PXC Compact (P2 Ethernet) All versions V2.8, Siemens:APOGEE PXC Modular (BACnet) All versions < V3.5.3, Siemens:APOGEE PXC Modular (P2 Ethernet) All versions V2.8, Siemens:TALON TC Compact (BACnet) All versions < V3.5.3, Siemens:TALON TC Modular (BACnet) All versions < V3.5.3
Sources
euvd EUVD-2021-14146

Description

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.

References