Auth bypass in Johnson Controls Facility Explorer Snc Series Supervisory Controllers (F4-Snc)
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 controller’s file system, allowing them to access or modify system files by sending specifically crafted web messages to the F4-SNC.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Johnson Controls Facility Explorer Snc Series Supervisory Controllers (F4-Snc) — versions Facility Explorer SNC Series Supervisory Controllers version 11 11
- Johnsoncontrols F4-Snc
- Johnsoncontrols F4-Snc Firmware — versions 11
Weakness classification (CWE)
References
- www.johnsoncontrols.com/cyber-solutions/security-advisories (Vendor Advisory)
- us-cert.cisa.gov/ics/advisories/icsa-21-182-01 (US Government Resource, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2021-27661?
- CVE-2021-27661 is a high-severity vulnerability in Johnson Controls Facility Explorer Snc Series Supervisory Controllers (F4-Snc), classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2021-07-01.
- How severe is CVE-2021-27661?
- High severity. CVSS v3 base score is 8.8 out of 10.