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CVE-2021-27661

HIGH
Published 2021-07-01T13:41:58.835758Z
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Expert Analysis

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CVSS Score

V3.1
8.8
/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.414
Higher than 41.4% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Johnson Controls

Facility Explorer SNC Series Supervisory Controllers (F4-SNC)

Affected Versions:

Facility Explorer SNC Series Supervisory Controllers version 11 11

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-3fjw-3ffh-wrxh

Advisory Details

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 Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-27661
WEB https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
WEB https://us-cert.gov/ics/advisories
WEB https://www.johnsoncontrols.com/cyber-solutions/security-advisories

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: April 4, 2024

References

https://www.johnsoncontrols.com/cyber-solutions/security-advisories
https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
Published: 2021-07-01T13:41:58.835758Z
Last Modified: 2024-09-16T22:14:19.833Z
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