Siemens APOGEE PXC Compact (BACnet)

CVE-2020-27738

MEDIUM 6.5

At a glance

Source: NVD
EPSS: EPSS 3.66 % · percentile 90 (2026-10-31)
State: PUBLISHED
Published: 2021-04-22 20:42 UTC
Updated: 2024-08-04 16:18 UTC
Assigner: siemens
NVD status: Modified

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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.

Weaknesses (CWE)

CWE-788 — Access of Memory Location After End of Buffer
CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	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	siemens
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H	NVD · productcert@siemens.com (Secondary)
CVSS 3.1	HIGH 7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 5.8	AV:N/AC:M/Au:N/C:P/I:N/A:P	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2020-20242
GCVE · GCVE-0-2020-27738

CERT-FR advisories

CERTFR-2023-AVI-0633 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
CERTFR-2021-AVI-854 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
CERTFR-2021-AVI-255 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:siemens:simotics_connect_400_firmware:*:*:*:*:*:*:*:* < 0.5.0.0
cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:* < 2017.02.3
cpe:2.3:a:siemens:nucleus_readystart_v4:*:*:*:*:*:*:*:* < 4.1.0
cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:*

Affected products

Product	Versions
Siemens · APOGEE PXC Compact (BACnet)	affected All versions < V3.5.5
Siemens · APOGEE PXC Compact (P2 Ethernet)	affected All versions < V2.8.20
Siemens · APOGEE PXC Modular (BACnet)	affected All versions < V3.5.5
Siemens · APOGEE PXC Modular (P2 Ethernet)	affected All versions < V2.8.20
Siemens · Nucleus NET	affected All versions
Siemens · Nucleus ReadyStart V3	affected All versions < V2017.02.3
Siemens · Nucleus ReadyStart V4	affected All versions < V4.1.0
Siemens · Nucleus Source Code	affected Versions including affected DNS modules
Siemens · SIMOTICS CONNECT 400	affected All versions < V0.5.0.0
Siemens · TALON TC Compact (BACnet)	affected All versions < V3.5.5
Siemens · TALON TC Modular (BACnet)	affected All versions < V3.5.5

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

🟡 Siemens APOGEE PXC Compact (BACnet)