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CVE-2023-3127

27
FAUCET Score

CVE-2023-3127 describes a critical authentication bypass vulnerability affecting Johnson Controls iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 products. An unauthenticated attacker can log in with full administrator rights, posing a severe security risk. This vulnerability has a CVSS score of 9.8 (Critical) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion, its high FAUCET Risk Score of 77/100 indicates significant potential danger.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.8.6, < 6.9.2CPE matchmatch criteria
cpe:2.3:o:johnsoncontrols:istar_ultra_firmware:*:*:*:*:*:*:*:*
6.9.2CPE matchmatch criteria
cpe:2.3:o:johnsoncontrols:istar_ultra_firmware:6.9.2:-:*:*:*:*:*:*
>= 6.8.6, < 6.9.2CPE matchmatch criteria
cpe:2.3:o:johnsoncontrols:istar_ultra_lt_firmware:*:*:*:*:*:*:*:*
6.9.2CPE matchmatch criteria
cpe:2.3:o:johnsoncontrols:istar_ultra_lt_firmware:6.9.2:-:*:*:*:*:*:*
< 6.9.2CPE matchmatch criteria
cpe:2.3:o:johnsoncontrols:istar_ultra_g2_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
1.6
Impact Score
5.3
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 23rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / news-events/ics-advisories/icsa-23-192-02
Third Party AdvisoryUS Government Resource
johnsoncontrols.com / cyber-solutions/security-advisories
Vendor Advisory