CVE-2021-25664

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 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.

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 (5)

Capital Vstar
Nucleus Readystart V4

Affected Vendors

Siemens

References (6)

https://cert-portal.siemens.com/productcert/html/ssa-248289.html
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
https://cert-portal.siemens.com/productcert/html/ssa-248289.html
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
40
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 2/34 · Minimal
Exposure 12/34 · Low