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CVE Record

CVE-2020-35683: An issue was discovered in HCC Nichestack 3.0.

An issue was discovered in HCC Nichestack 3.0. The code that parses ICMP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the ICMP checksum. When the IP payload size is set to be smaller than the size of the IP header, the ICMP checksum computation function may read out of bounds, causing a Denial-of-Service.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-35683 is a denial-of-service flaw in HCC Nichestack 3.0, an embedded networking stack. Malformed ICMP packet handling can make vulnerable devices read memory out of bounds during checksum processing, potentially disrupting device availability. Business urgency depends on whether critical products in the environment use this stack.

Executive priority

Treat this as an availability risk for embedded and OT assets, not a confirmed widespread compromise. Prioritize inventory and vendor confirmation first, then patch or isolate affected critical devices where operational impact would be material.

Technical view

The ICMP parser trusts an IP payload size value from the IP header while computing the ICMP checksum. If that value is smaller than the IP header size, checksum processing may read out of bounds and cause denial of service. The source bundle does not provide CVSS, CWE, patch level, or a complete affected product matrix.

Likely exposure

Exposure is most likely in embedded, industrial, or operational technology products that include HCC Nichestack 3.0. The CVE source does not identify specific affected products beyond Nichestack, so exposure must be confirmed through vendor advisories, SBOMs, firmware notes, and product support channels.

Exploitation context

The source bundle does not cite CISA KEV listing or active exploitation. The issue is network-adjacent because it involves ICMP packet parsing, but the provided sources support only denial-of-service impact, not code execution or confirmed exploitation in the wild.

Researcher notes

Evidence is limited to the CVE description and referenced advisories. The affected field is incomplete, CVSS is absent, and no CWE is listed. Avoid assuming all Nichestack-based products are affected; validate product-specific integration and vendor status before scoring or remediation decisions.

Mitigation direction

  • Identify products and firmware that include HCC Nichestack 3.0.
  • Check HCC, CERT/CC, Siemens, and device-vendor advisories for fixes.
  • Apply vendor-supplied firmware or stack updates when available.
  • Use vendor-approved network controls to limit unnecessary ICMP exposure.
  • Prioritize devices supporting safety, production, or remote access functions.

Validation and detection

  • Review SBOMs, firmware documentation, and supplier attestations for Nichestack 3.0.
  • Map devices exposing IP networking on sensitive OT or embedded networks.
  • Check vendor advisory status for each affected product model and version.
  • Confirm whether available firmware updates address CVE-2020-35683.
  • Document residual exposure where vendor fixes are unavailable or unconfirmed.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2020-35683 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.