Security readout for executives and security teams
Plain-English summary
This CVE affects the DNS client in InterNiche NicheStack TCP/IP 4.0.1. Weak randomness in DNS transaction IDs could let a remote attacker poison DNS cache entries, causing affected devices to resolve names to the wrong destination.
Executive priority
Treat this as an inventory-driven OT and embedded device risk. Priority should rise for safety, production, or remote-site devices that depend on DNS and cannot be quickly patched.
Technical view
The issue is insufficient entropy in DNS transaction IDs in dns_query_type(). The stated impact is remote DNS cache poisoning using a specific DNS response packet. The source bundle does not provide CVSS, CWE, named fixed versions, or affected downstream device lists.
Likely exposure
Exposure is most likely in embedded or operational technology devices that include InterNiche NicheStack TCP/IP 4.0.1 and use its DNS client. The provided CVE data does not identify downstream vendors or products.
Exploitation context
The source bundle does not state active exploitation, and CISA KEV is false. Exploitation is described only as remote DNS cache poisoning via a specific DNS response packet, with no public exploit evidence included here.
Researcher notes
Evidence is incomplete: the CVE record names NicheStack TCP/IP 4.0.1 and dns_query_type(), but does not list CVSS, CWE, fixed versions, or downstream products. Avoid assuming all NicheStack versions or OEM devices are affected without vendor confirmation.
Mitigation direction
- Identify devices or firmware that include InterNiche NicheStack TCP/IP 4.0.1.
- Check vendor, CERT/CC, and Forescout guidance for fixed firmware or mitigations.
- Restrict DNS traffic paths for affected embedded and OT devices.
- Use trusted internal DNS resolvers where feasible.
- Monitor for unexpected DNS answers or resolution changes.
Validation and detection
- Review SBOMs, firmware notes, and vendor advisories for NicheStack usage.
- Confirm whether affected devices use the NicheStack DNS client.
- Check network policy for device DNS egress and resolver restrictions.
- Review DNS logs for anomalous responses involving affected devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-25926 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/CVE reference · x_refsource_MISC
- VU#608209CVE reference · third-party-advisory, x_refsource_CERT-VN
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.