High severity7.5NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026
CVE-2021-25664
CVE-2021-25664
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 the Hop-by-Hop extension header in IPv6 packets and its options lacks any checks against the length field of the header, allowing attackers to put the function into an infinite loop by supplying arbitrary length values.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
10(expand)+ 1 more
- (no CPE)
- (no CPE)range: All versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: 0
(expand)+ 1 more
- (no CPE)
- (no CPE)range: 0
- Range: 0
0+ 1 more
- (no CPE)range: 0
- (no CPE)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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