High severity · published Aug 19, 2021
CVE-2021-27565
The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP…
7.5
CVSS
2.6%
EPSS
No
On KEV
Description
The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP request such as OPTIONS. This occurs because the HTTP request handler enters a miscoded wbs_loop() debugger hook.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NI
Nichestack · Hcc-embedded
through 4.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27565
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27565
Mitigation
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/
Product
https://www.hcc-embedded.com/
Product
https://www.hcc-embedded.com/about/about-interniche
Third Party Advisory
https://www.kb.cert.org/vuls/id/608209
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