Vulnerability Details : 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). 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.
Products affected by CVE-2021-27393
- cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27393
0.22%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 45 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27393
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST |
CWE ids for CVE-2021-27393
-
The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.Assigned by:
- nvd@nist.gov (Secondary)
- productcert@siemens.com (Primary)
References for CVE-2021-27393
-
https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf
Vendor Advisory
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