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CVE-2021-27393

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 Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. 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.

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 < V2013.08affectedUnavailableUnavailableUnavailableNone 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