Vulnerability · Published Apr 22, 2021 · Assigned by siemens
CVE-2021-25677
Medium 5.3
In plain English
A medium-severity weak randomness in APOGEE PXC Compact (BACnet) from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).
Official description
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), SIMOTICS CONNECT 400 (All versions >= V0.5.0.0 < V1.0.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | APOGEE PXC Compact (BACnet) | All versions < V3.5.5 |
| Siemens | APOGEE PXC Compact (P2 Ethernet) | All versions < V2.8.20 |
| Siemens | APOGEE PXC Modular (BACnet) | All versions < V3.5.5 |
| Siemens | APOGEE PXC Modular (P2 Ethernet) | All versions < V2.8.20 |
| Siemens | Nucleus NET | All versions |
| Siemens | Nucleus ReadyStart V3 | All versions < V2017.02.3 |
| Siemens | Nucleus ReadyStart V3 | All versions < V2017.02.4 |
| Siemens | Nucleus ReadyStart V4 | All versions < V4.1.0 |
| Siemens | Nucleus Source Code | Versions including affected DNS modules |
| Siemens | SIMOTICS CONNECT 400 | All versions < V0.5.0.0 |
| Siemens | SIMOTICS CONNECT 400 | All versions >= V0.5.0.0 < V1.0.0.0 |
| Siemens | TALON TC Compact (BACnet) | All versions < V3.5.5 |
| Siemens | TALON TC Modular (BACnet) | All versions < V3.5.5 |
Weakness: CWE-330 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C