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CVE-2021-25664

7.5 · HIGH

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…

Published Apr 22, 2021CWE-835EPSS 1.88%

Overview

CVE-2021-25664 is a high-severity vulnerability. It was published on April 22, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcert-portal.siemens.com/productcert/html/ssa-248289.htmlRefcert-portal.siemens.com/productcert/pdf/ssa-248289.pdfCISAus-cert.cisa.gov/ics/advisories/icsa-21-103-05Refcert-portal.siemens.com/productcert/html/ssa-248289.htmlRefcert-portal.siemens.com/productcert/pdf/ssa-248289.pdfCISAus-cert.cisa.gov/ics/advisories/icsa-21-103-05

How CyberStrike helps

Frequently asked questions

What is CVE-2021-25664?

CVE-2021-25664 is a high-severity vulnerability. It was published on April 22, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-25664?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-25664?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-25664?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-25664 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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