01 Record

CVE-2020-35684

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

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02 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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 2.28% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 82.6% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-08-19 11:19Z5 YR AGO

Last updated

2024-08-04 17:09Z2 YR AGO

Reserved

2020-12-24

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

440a78a1e5ff7e0e37061a2dfc9d35d95af4828b8448845f861694d7387c7dc0

05 Affected products

VendorProductVersionsPlatforms

hcc-embeddednichestackNot specified—

siemenssentron_3wa_com190Not specified—

siemenssentron_3wa_com190_firmwareNot specified—

siemenssentron_3wl_com35Not specified—

siemenssentron_3wl_com35_firmwareNot specified—

06 References

www.hcc-embedded.comhttps://www.hcc-embedded.comx_refsource_MISC
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdfx_refsource_CONFIRM
www.forescout.comhttps://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/x_refsource_MISC
www.kb.cert.orgVU#608209https://www.kb.cert.org/vuls/id/608209third-party-advisoryx_refsource_CERT-VN