High severity7.5NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026
CVE-2021-25663
CVE-2021-25663
Description
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
11- Range: <V4.1.0
All versions+ 1 more
- (no CPE)range: All versions
- (no CPE)range: All versions
<V2017.02.4+ 2 more
- (no CPE)range: <V2017.02.4
- (no CPE)range: 0
- (no CPE)range: 0
< V2303+ 1 more
- (no CPE)range: < V2303
- (no CPE)range: 0
All versions+ 1 more
- (no CPE)range: All versions
- (no CPE)range: 0
- Range: 0
Patches
Vulnerability mechanics
References
3- cert-portal.siemens.com/productcert/pdf/ssa-248289.pdfnvdVendor Advisory
- us-cert.cisa.gov/ics/advisories/icsa-21-103-05nvdThird Party AdvisoryUS Government Resource
- cert-portal.siemens.com/productcert/html/ssa-248289.htmlnvd
News mentions
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