What is CVE-2020-25926?

CVE-2020-25926 is a high-severity vulnerability in Hcc-Embedded Nichestack Tcp\/ip, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2021-08-18.

How severe is CVE-2020-25926?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hcc-Embedded Nichestack Tcp\/ip

CVE-2020-25926

The DNS client in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Insufficient entropy in the DNS transaction id. The impact is: DNS cache poisoning (remote). The component is: dns_query_type(). The attack vector is: a specific DNS response packet.

Published 2021-08-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Hcc-Embedded Nichestack Tcp\/ip — versions 4.0.1

Weakness classification (CWE)

CWE-331 — Insufficient Entropy

References

www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-foun… (Third Party Advisory, Mitigation)
www.kb.cert.org/vuls/id/608209 (US Government Resource, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2020-25926?: CVE-2020-25926 is a high-severity vulnerability in Hcc-Embedded Nichestack Tcp\/ip, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2021-08-18.
How severe is CVE-2020-25926?: High severity. CVSS v3 base score is 7.5 out of 10.