Home/CVE/A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ether
CVE

CVE-2020-27736

A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ether

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.

MEDIUM · CVSS 6.5 EPSS 0.00827
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
CWE-170Improper Null Termination
▤

Affected Products & Versions

5
siemens nucleus netall versions
siemens nucleus readystart v3< 2017.02.3
siemens nucleus readystart v4< 4.1.0
siemens nucleus source codeall versions
siemens simotics connect 400 firmware< 0.5.0.0
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · productcert@siemens.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Apr 2021 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
⚑

Vendor Advisories

5
siemens-csafSSA-180579
siemens-csafSSA-669158
siemens-csafSSA-705111
cisa-csafcisa-csaf-csaf_files-OT-white-2021-icsa-21-103-13
cisa-csafcisa-csaf-csaf_files-OT-white-2022-icsa-22-349-16
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdfPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdfPatchVendor Advisory
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