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CVE Record

CVE-2020-25767: An issue was discovered in HCC Embedded NicheStack IPv4 4.1.

An issue was discovered in HCC Embedded NicheStack IPv4 4.1. The dnc_copy_in routine for parsing DNS domain names does not check whether a domain name compression pointer is pointing within the bounds of the packet (e.g., forward compression pointer jumps are allowed), which leads to an Out-of-bounds Read, and a Denial-of-Service as a consequence.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This vulnerability can let a malformed DNS name crash or disrupt software using HCC Embedded NicheStack IPv4 4.1. The provided sources describe denial-of-service impact, not data theft or remote control. Business urgency depends on whether this stack is present in operational or embedded systems.

Executive priority

Treat this as an inventory and vendor-follow-up priority for embedded or OT environments. Escalate if affected systems support critical operations or receive DNS traffic from untrusted networks. No active exploitation signal is provided.

Technical view

The DNS domain-name parser routine dnc_copy_in does not verify that a compression pointer stays within packet bounds. Invalid pointer handling can cause an out-of-bounds read and denial-of-service. The bundle does not provide CVSS, CWE, confirmed affected device models, or a named patch.

Likely exposure

Likely exposure is limited to products or firmware using HCC Embedded NicheStack IPv4 4.1, especially systems that process DNS traffic. The provided affected-product metadata is incomplete and lists no concrete vendors or device models.

Exploitation context

CISA KEV status is false, and the provided sources do not state active exploitation. The known consequence is denial-of-service from malformed DNS parsing, but the bundle does not provide exploit prevalence or practical attack requirements.

Researcher notes

The core issue is pointer bounds validation in DNS name decompression. Evidence is thin beyond the CVE description and public advisories; avoid assuming affected product families, exploit maturity, or remediation specifics without vendor confirmation.

Mitigation direction

  • Inventory embedded and OT assets for HCC Embedded NicheStack IPv4 4.1 usage.
  • Check HCC Embedded, device vendor, and CERT/CC guidance for patches or mitigations.
  • Prioritize vendor firmware updates for exposed DNS-processing devices.
  • Restrict untrusted DNS traffic to affected embedded systems where operationally feasible.
  • Monitor critical devices for unexpected crashes or service instability.

Validation and detection

  • Confirm whether device firmware includes HCC Embedded NicheStack IPv4 4.1.
  • Review vendor advisories for affected models and fixed firmware versions.
  • Check network exposure for systems processing DNS packets from untrusted networks.
  • Correlate outages or watchdog resets with unusual DNS traffic patterns.
  • Document systems where vendor status remains unknown.
Prepared
Confidence
medium
Sources
4

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-2020-25767 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
3Source 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.