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CVE-2021-31401

7.5 · HIGH

An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1.

Published Aug 19, 2021CWE-20EPSS 2.25%

Overview

CVE-2021-31401 is a high-severity vulnerability. It was published on August 19, 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

An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1. The TCP header processing code doesn't sanitize the value of the IP total length field (header length + data length). With a crafted IP packet, an integer overflow occurs whenever the value of the IP data length is calculated by subtracting the length of the header from the total length of the IP packet.

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/pdf/ssa-789208.pdfRefwww.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Refwww.kb.cert.org/vuls/id/608209Refcert-portal.siemens.com/productcert/pdf/ssa-789208.pdfRefwww.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/Refwww.kb.cert.org/vuls/id/608209

How CyberStrike helps

Frequently asked questions

What is CVE-2021-31401?

CVE-2021-31401 is a high-severity vulnerability. It was published on August 19, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-31401?

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-2021-31401?

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-2021-31401?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-31401 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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