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CVE-2021-25677

CVE.org · Published

Historical CVEsJSONAI instructions

Record status
Published
Identifier year (not publication year)
2021
Source publication
Source updated
Imported by cveboard
Source snapshot
cve_2026-10-24_midnight_baseline ·

Plain text

CNA source text (English)

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 V3 (All versions < V2017.02.4), 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), SIMOTICS CONNECT 400 (All versions >= V0.5.0.0 < V1.0.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

APOGEE PXC Compact (BACnet)

Vendor
Siemens
Product
APOGEE PXC Compact (BACnet)
Platforms
Unknown
Default status
unknown
APOGEE PXC Compact (BACnet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V3.5.5affectedUnavailableUnavailableUnavailableNone listed

APOGEE PXC Compact (P2 Ethernet)

Vendor
Siemens
Product
APOGEE PXC Compact (P2 Ethernet)
Platforms
Unknown
Default status
unknown
APOGEE PXC Compact (P2 Ethernet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V2.8.20affectedUnavailableUnavailableUnavailableNone listed

APOGEE PXC Modular (BACnet)

Vendor
Siemens
Product
APOGEE PXC Modular (BACnet)
Platforms
Unknown
Default status
unknown
APOGEE PXC Modular (BACnet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V3.5.5affectedUnavailableUnavailableUnavailableNone listed

APOGEE PXC Modular (P2 Ethernet)

Vendor
Siemens
Product
APOGEE PXC Modular (P2 Ethernet)
Platforms
Unknown
Default status
unknown
APOGEE PXC Modular (P2 Ethernet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V2.8.20affectedUnavailableUnavailableUnavailableNone listed

Nucleus NET

Vendor
Siemens
Product
Nucleus NET
Platforms
Unknown
Default status
unknown
Nucleus NET · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versionsaffectedUnavailableUnavailableUnavailableNone listed

Nucleus ReadyStart V3

Vendor
Siemens
Product
Nucleus ReadyStart V3
Platforms
Unknown
Default status
unknown
Nucleus ReadyStart V3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V2017.02.3affectedUnavailableUnavailableUnavailableNone listed

Nucleus ReadyStart V3

Vendor
Siemens
Product
Nucleus ReadyStart V3
Platforms
Unknown
Default status
unknown
Nucleus ReadyStart V3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V2017.02.4affectedUnavailableUnavailableUnavailableNone listed

Nucleus ReadyStart V4

Vendor
Siemens
Product
Nucleus ReadyStart V4
Platforms
Unknown
Default status
unknown
Nucleus ReadyStart V4 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V4.1.0affectedUnavailableUnavailableUnavailableNone listed

Nucleus Source Code

Vendor
Siemens
Product
Nucleus Source Code
Platforms
Unknown
Default status
unknown
Nucleus Source Code · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
Versions including affected DNS modulesaffectedUnavailableUnavailableUnavailableNone listed

SIMOTICS CONNECT 400

Vendor
Siemens
Product
SIMOTICS CONNECT 400
Platforms
Unknown
Default status
unknown
SIMOTICS CONNECT 400 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V0.5.0.0affectedUnavailableUnavailableUnavailableNone listed

SIMOTICS CONNECT 400

Vendor
Siemens
Product
SIMOTICS CONNECT 400
Platforms
Unknown
Default status
unknown
SIMOTICS CONNECT 400 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions >= V0.5.0.0 < V1.0.0.0affectedUnavailableUnavailableUnavailableNone listed

TALON TC Compact (BACnet)

Vendor
Siemens
Product
TALON TC Compact (BACnet)
Platforms
Unknown
Default status
unknown
TALON TC Compact (BACnet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V3.5.5affectedUnavailableUnavailableUnavailableNone listed

TALON TC Modular (BACnet)

Vendor
Siemens
Product
TALON TC Modular (BACnet)
Platforms
Unknown
Default status
unknown
TALON TC Modular (BACnet) · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
All versions < V3.5.5affectedUnavailableUnavailableUnavailableNone listed