High severity · published Jul 1, 2021
CVE-2021-27661
Successful exploitation of this vulnerability could give an authenticated Facility Explorer SNC Series Supervisory Controller (F4-SNC) user an unintended level of access to the…
8.8
CVSS
0.8%
EPSS
No
On KEV
Description
Successful exploitation of this vulnerability could give an authenticated Facility Explorer SNC Series Supervisory Controller (F4-SNC) user an unintended level of access to the controller’s file system, allowing them to access or modify system files by sending specifically crafted web messages to the F4-SNC.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
F4-snc Firmware · Johnsoncontrols
11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27661
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27661
Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
Vendor Advisory
https://www.johnsoncontrols.com/cyber-solutions/security-advisories
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