CVE-2021-27391
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.37% — more likely to be exploited than 88% of all CVEs |
| Weakness | CWE-120 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-09-14 |
| Last modified | 2026-06-17 |
Affected (16)
| Vendor | Product |
|---|---|
| siemens | apogee mbc \(ppc\) \(p2 ethernet\) |
| siemens | apogee mbc \(ppc\) \(p2 ethernet\) firmware |
| siemens | apogee mec \(ppc\) \(p2 ethernet\) |
| siemens | apogee mec \(ppc\) \(p2 ethernet\) firmware |
| siemens | apogee pxc bacnet automation controller |
| siemens | apogee pxc bacnet automation controller firmware |
| siemens | apogee pxc compact \(p2 ethernet\) |
| siemens | apogee pxc compact \(p2 ethernet\) firmware |
| siemens | apogee pxc modular \(bacnet\) |
| siemens | apogee pxc modular \(bacnet\) firmware |
| siemens | apogee pxc modular \(p2 ethernet\) |
| siemens | apogee pxc modular \(p2 ethernet\) firmware |
| siemens | talon tc compact \(bacnet\) |
| siemens | talon tc compact \(bacnet\) firmware |
| siemens | talon tc modular \(bacnet\) |
| siemens | talon tc modular \(bacnet\) firmware |
References
→ the Explorer · watch your stack · NVD