Vulnerability · Published Apr 22, 2021 · Assigned by siemens
CVE-2021-27393
Medium 5.3
In plain English
A medium-severity weak randomness in Nucleus NET from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities).
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Nucleus NET | All versions |
| Siemens | Nucleus ReadyStart V3 | All versions < V2013.08 |
| Siemens | Nucleus Source Code | Versions including affected DNS modules |
Weakness: CWE-330
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf x_refsource_MISC