CVE-2020-27738: Buffer Overflow
First published: Thu Apr 22 2021(Updated: )
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 record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a read access 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.
Credit: productcert@siemens.com productcert@siemens.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Siemens Simotics Connect 400 Firmware | <0.5.0.0 | |
| Siemens Simotics Connect 400 | ||
| Siemens Nucleus NET | ||
| Siemens Nucleus ReadyStart v3 | <2017.02.3 | |
| Siemens Nucleus ReadyStart v4 | <4.1.0 | |
| Siemens Nucleus Source Code |
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Frequently Asked Questions
What is the vulnerability identifier?
The vulnerability identifier is CVE-2020-27738.
What is the severity of CVE-2020-27738?
The severity of CVE-2020-27738 is high with a severity value of 7.4.
Which software versions are affected by CVE-2020-27738?
The affected software versions are 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 R.
Is Siemens Simotics Connect 400 Firmware vulnerable to CVE-2020-27738?
Yes, Siemens Simotics Connect 400 Firmware with versions up to exclusive 0.5.0.0 is vulnerable to CVE-2020-27738.
Are Siemens Nucleus Net and Siemens Nucleus Readystart V3/V4 affected by CVE-2020-27738?
Yes, Siemens Nucleus Net, Siemens Nucleus Readystart V3 (up to exclusive 2017.02.3), and Siemens Nucleus Readystart V4 (up to exclusive 4.1.0) are affected by CVE-2020-27738.
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- vendor/siemens
- canonical/siemens simotics connect 400 firmware
- canonical/siemens simotics connect 400
- canonical/siemens nucleus net
- canonical/siemens nucleus readystart v3
- canonical/siemens nucleus readystart v4
- canonical/siemens nucleus source code