Medium severity5.3NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026
CVE-2021-27393
CVE-2021-27393
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
6All versions+ 1 more
- (no CPE)range: All versions
- (no CPE)range: All versions
< V2013.08+ 1 more
- (no CPE)range: < V2013.08
- (no CPE)range: All versions < V2013.08
Versions including affected DNS modules+ 1 more
- (no CPE)range: Versions including affected DNS modules
- (no CPE)range: Versions including affected DNS modules
Patches
Vulnerability mechanics
References
1- cert-portal.siemens.com/productcert/pdf/ssa-201384.pdfnvdVendor Advisory
News mentions
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