CVE-2021-31228

HIGH
7.5
CVSS Score
Published: August 19, 2021 at 10:51 AM UTC
Updated: June 17, 2026 at 03:51 AM UTC
1 product affected across 1 vendorNichestack

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.3
Affected range stops below 4.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

Third Party Advisoryx_refsource_CERT-VNx_refsource_MISCUS Government Resource
https://www.kb.cert.org/vuls/id/608209

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-330

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