Vulnerability Details CVE-2020-27738
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.009
EPSS Ranking 73.9%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 5.8
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf
Products affected by CVE-2020-27738
-
cpe:2.3:a:siemens:nucleus_net:-
-
cpe:2.3:a:siemens:nucleus_net:5.2
-
cpe:2.3:a:siemens:nucleus_readystart_v3:2013.08
-
cpe:2.3:a:siemens:nucleus_readystart_v4:*
-
cpe:2.3:a:siemens:nucleus_source_code:-
-
cpe:2.3:h:siemens:simotics_connect_400:-
-
cpe:2.3:o:siemens:simotics_connect_400_firmware:-
-
cpe:2.3:o:siemens:simotics_connect_400_firmware:0.3.0.95