{"api_version":"1","generated_at":"2026-04-22T23:21:47+00:00","cve":"CVE-2020-27738","urls":{"html":"https://cve.report/CVE-2020-27738","api":"https://cve.report/api/cve/CVE-2020-27738.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-27738","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-27738"},"summary":{"title":"CVE-2020-27738","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 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.","state":"PUBLIC","assigner":"productcert@siemens.com","published_at":"2021-04-22 21:15:00","updated_at":"2023-08-08 10:15:00"},"problem_types":["CWE-119"],"metrics":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf","refsource":"MISC","tags":[],"title":"","mime":"application/pdf","httpstatus":"200","archivestatus":"200"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf","refsource":"MISC","tags":[],"title":"","mime":"application/pdf","httpstatus":"200","archivestatus":"404"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf","refsource":"MISC","tags":[],"title":"","mime":"application/pdf","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-27738","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27738","name":"NVD vulnerability 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SIMOTICS CONNECT 400 Multiple Vulnerabilities (ICSA-21-103-13)"}]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2020-27738","ASSIGNER":"productcert@siemens.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-788: Access of Memory Location After End of Buffer","cweId":"CWE-788"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Siemens","product":{"product_data":[{"product_name":"APOGEE PXC Compact (BACnet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V3.5.5"}]}},{"product_name":"APOGEE PXC Compact (P2 Ethernet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V2.8.20"}]}},{"product_name":"APOGEE PXC Modular (BACnet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V3.5.5"}]}},{"product_name":"APOGEE PXC Modular (P2 Ethernet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V2.8.20"}]}},{"product_name":"Nucleus NET","version":{"version_data":[{"version_affected":"=","version_value":"All versions"}]}},{"product_name":"Nucleus ReadyStart V3","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V2017.02.3"}]}},{"product_name":"Nucleus ReadyStart V4","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V4.1.0"}]}},{"product_name":"Nucleus Source Code","version":{"version_data":[{"version_affected":"=","version_value":"Versions including affected DNS modules"}]}},{"product_name":"SIMOTICS CONNECT 400","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V0.5.0.0"}]}},{"product_name":"TALON TC Compact (BACnet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V3.5.5"}]}},{"product_name":"TALON TC Modular (BACnet)","version":{"version_data":[{"version_affected":"=","version_value":"All versions < V3.5.5"}]}}]}}]}},"references":{"reference_data":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf","refsource":"MISC","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf","refsource":"MISC","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf","refsource":"MISC","name":"https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf"}]},"impact":{"cvss":[{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H/E:P/RL:O/RC:C","baseScore":6.5,"baseSeverity":"MEDIUM"}]}},"nvd":{"publishedDate":"2021-04-22 21:15:00","lastModifiedDate":"2023-08-08 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vulnerability has been identified in 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). 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.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"27738","Ordinal":"2","NoteData":"2021-04-22","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"27738","Ordinal":"3","NoteData":"2022-01-11","Type":"Other","Title":"Modified"}]}}}