CVE-2020-27736
6.5 · MEDIUMOverview
CVE-2020-27736 is a medium-severity vulnerability affecting siemens nucleus_net. It was published on April 22, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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 V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the read memory.
Remediation
Check the references section for vendor advisories and patches from siemens. Update nucleus_net to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| siemens | nucleus_readystart_v3 | >= 0, < 2017.02.3 | Affected |
| siemens | nucleus_readystart_v4 | >= 0, < 4.1.0 | Affected |
| siemens | simotics_connect_400_firmware | >= 0, < 0.5.0.0 | Affected |
References
Frequently Asked Questions
What is CVE-2020-27736?
CVE-2020-27736 is a medium-severity vulnerability affecting siemens nucleus_net. It was published on April 22, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2020-27736?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2020-27736?
Check the references section for vendor advisories and patches from siemens. Update nucleus_net to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-27736?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-27736 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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