CVE-2021-31228 json
An issue was discovered in HCC embedded InterNiche 4.0.1.
published 2021-08-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18141
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
An issue was discovered in HCC embedded InterNiche 4.0.1. This vulnerability allows the attacker to predict a DNS query's source port in order to send forged DNS response packets that will be accepted as valid answers to the DNS client's requests (without sniffing the specific request). Data is predictable because it is based on the time of day, and has too few bits.
Patch / fix
- hcc-embedded nichestack 4.3
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-217-01 updated cvss 4.0
HCC Embedded InterNiche TCP/IP stack, NicheLite (Update B)
-
HCC Embedded InterNiche stack < 4.3 HCC Embedded NicheLite < 4.3affected: vendor fix mitsubishielectric.com
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
1.27% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-330 Use of Insufficiently Random Values
References
-
forescout.com
/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
mitigation, third-party-advisory
-
kb.cert.org
/vuls/id/608209
third-party-advisory, us-government-resource
Sources
- CVE List CVE-2021-31228
- NVD CVE-2021-31228
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.