CVE-2021-25663
moderate-risk
Published 2021-04-22
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.
Do I need to act?
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0.52% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (4)
Affected Vendors
References (6)
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05
38
/ 100
moderate-risk
Severity
26/34 · High
Exploitability
2/34 · Minimal
Exposure
10/34 · Low