High severity · published Aug 19, 2021
CVE-2021-31228
An issue was discovered in HCC embedded InterNiche 4.0.1
7.5
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 70% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NI
Nichestack · Hcc-embedded
before 4.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31228
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31228
Mitigation
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
Third Party Advisory
https://www.kb.cert.org/vuls/id/608209
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