SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2021-27391

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…

CRITICAL 9.8EPSS 3.37%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
3.37% probability · 88th percentile
CISA KEV
Not listed
Weakness
CWE-120
Affected
siemens/apogee mbc \(ppc\) \(p2 ethernet\) firmware · siemens/apogee mec \(ppc\) \(p2 ethernet\) firmware · siemens/apogee pxc bacnet automation controller firmware · siemens/apogee pxc compact \(p2 ethernet\) firmware · siemens/apogee pxc modular \(bacnet\) firmware · siemens/apogee pxc modular \(p2 ethernet\) firmware · siemens/talon tc compact \(bacnet\) firmware · siemens/talon tc modular \(bacnet\) firmware
Source
productcert@siemens.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.