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CVE-2020-35684

7.5 · HIGH

An issue was discovered in HCC Nichestack 3.0.

Published Aug 19, 2021CWE-20EPSS 2.29%

Overview

CVE-2020-35684 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 HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payload within the TCP checksum computation function. When the IP payload size is set to be smaller than the size of the IP header, the TCP checksum computation function may read out of bounds (a low-impact write-out-of-bounds is also possible).

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.hcc-embedded.comRefwww.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.hcc-embedded.comRefwww.kb.cert.org/vuls/id/608209

How CyberStrike helps

Frequently asked questions

What is CVE-2020-35684?

CVE-2020-35684 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-2020-35684?

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-2020-35684?

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-2020-35684?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-35684 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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