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I. Basic Information for CVE-2021-25677
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不充分的随机数
Source: NVD (National Vulnerability Database)
Vulnerability Title
多款Siemens产品 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens TALON Series是德国西门子（Siemens）公司的一个开放系统。使控制器和应用程序在单个平台上运行，同时彼此互操作。 多款Siemens产品存在安全特征问题漏洞，该漏洞源于DNS客户端未正确随机化DNS事务ID。远程攻击者可能会破坏DNS缓存或欺骗DNS解析，破坏目标系统。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
SiemensAPOGEE PXC Compact (BACnet) All versions < V3.5.5 -
SiemensAPOGEE PXC Compact (P2 Ethernet) All versions < V2.8.20 -
SiemensAPOGEE PXC Modular (BACnet) All versions < V3.5.5 -
SiemensAPOGEE PXC Modular (P2 Ethernet) All versions < V2.8.20 -
SiemensNucleus NET All versions -
SiemensNucleus ReadyStart V3 All versions < V2017.02.3 -
SiemensNucleus ReadyStart V3 All versions < V2017.02.4 -
SiemensNucleus ReadyStart V4 All versions < V4.1.0 -
SiemensNucleus Source Code Versions including affected DNS modules -
SiemensSIMOTICS CONNECT 400 All versions < V0.5.0.0 -
SiemensSIMOTICS CONNECT 400 All versions >= V0.5.0.0 < V1.0.0.0 -
SiemensTALON TC Compact (BACnet) All versions < V3.5.5 -
SiemensTALON TC Modular (BACnet) All versions < V3.5.5 -
II. Public POCs for CVE-2021-25677
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III. Intelligence Information for CVE-2021-25677
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IV. Related Vulnerabilities
Same product: APOGEE PXC Compact (BACnet)
Same vendor: Siemens
Same weakness: CWE-330
V. Comments for CVE-2021-25677

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