Log in Start free

Vulnerability · Published Sep 14, 2021 · Assigned by siemens

CVE-2021-27391

Critical 9.8

In plain English

A critical-severity buffer overflow in APOGEE MBC (PPC) (P2 Ethernet) from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.4% (higher than 89% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)3.4%top 11.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
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

Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References