by Kastro
Paper/Archive/CVE-2021-27391

CVE-2021-27391

Siemens APOGEE MBC (PPC) (P2 Ethernet) — A vulnerability has been identified in APOGEE MBC (PPC) (P2 Ethernet) (All versions >= V2.6.3), APOGEE MEC (PPC) (P2 Ethernet) (All versi…

EPSS 3%CVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (ADP, NVD agree)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 88.8.888 × 2017.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
APOGEE MBC (PPC) (P2 Ethernet)All versions >= V2.6.3–CNA
APOGEE MEC (PPC) (P2 Ethernet)All versions >= V2.6.3–CNA
APOGEE PXC Compact (BACnet)All versions < V3.5.3–CNA
APOGEE PXC Compact (P2 Ethernet)All versions >= V2.8–CNA
APOGEE PXC Modular (BACnet)All versions < V3.5.3–CNA
APOGEE PXC Modular (P2 Ethernet)All versions >= V2.8–CNA
TALON TC Compact (BACnet)All versions < V3.5.3–CNA
TALON TC Modular (BACnet)All versions < V3.5.3–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refcert-portal.siemens.com/productcert/pdf/ssa-944498.pdf