Vulnerability Details : 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 >= 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.
Vulnerability category: OverflowExecute code
Products affected by CVE-2021-27391
- cpe:2.3:o:siemens:apogee_pxc_bacnet_automation_controller_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:apogee_mbc_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Apogee Mbc (ppc) (p2 Ethernet)
- cpe:2.3:o:siemens:apogee_mec_\(ppc\)_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Apogee Mec (ppc) (p2 Ethernet)
- cpe:2.3:o:siemens:apogee_pxc_compact_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Apogee Pxc Compact (p2 Ethernet)
- cpe:2.3:o:siemens:apogee_pxc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Apogee Pxc Modular (bacnet)
- cpe:2.3:o:siemens:apogee_pxc_modular_\(p2_ethernet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Apogee Pxc Modular (p2 Ethernet)
- cpe:2.3:o:siemens:talon_tc_compact_\(bacnet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Talon Tc Compact (bacnet)
- cpe:2.3:o:siemens:talon_tc_modular_\(bacnet\)_firmware:*:*:*:*:*:*:*:*When used together with: Siemens » Talon Tc Modular (bacnet)
Exploit prediction scoring system (EPSS) score for CVE-2021-27391
0.82%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 82 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27391
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-27391
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The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by: productcert@siemens.com (Primary)
References for CVE-2021-27391
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https://cert-portal.siemens.com/productcert/pdf/ssa-944498.pdf
Patch;Vendor Advisory
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