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Medium severity · published Apr 22, 2021
CVE-2021-27393
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)
5.3
CVSS
0.8%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NN
Nucleus Net · Siemens
All versions, or not specified · source: NVD
NR
Nucleus Readystart V3 · Siemens
before 2013.08 · source: NVD
NS
Nucleus Source Code · Siemens
All versions, or not specified · source: NVD
Affected product
NN
Nucleus Net
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27393
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27393
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf
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