CVE-2023-3127: An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with adm

Q: How do I fix CVE-2023-3127?

istar ultra firmware: upgrade to 6.9.2; istar ultra lt firmware: upgrade to 6.9.2; istar ultra g2 firmware: upgrade to 6.9.2. Exact commands for each OS are on this page.

Q: Is CVE-2023-3127 being exploited?

CVE-2023-3127 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-3127 affect?

CVE-2023-3127 affects istar ultra firmware, istar ultra lt firmware, istar ultra g2 firmware. Severity is high (CVSS 7.5). An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with administrator rights.

Routine

HIGH 7.5UPGRADEUPGRADEUPGRADE

CVE-2023-3127 is a high-severity flaw (CVSS 7.5) affecting istar ultra firmware, istar ultra lt firmware, istar ultra g2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with administrator rights.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-287
Published	2023-07-11
Last modified	2026-06-17

Publisher (CNA): Johnson Controls · Vendor: johnsoncontrols

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-11 22:15 UTCPublished CVE record published
2026-06-17 06:13 UTCUpdated Record last modified

johnsoncontrols istar ultra firmware UPGRADE

Affected: >= 6.8.6 and < 6.9.2 · 6.9.2

Fixed in: 6.9.2

Safe to downgrade to: a release before 6.8.6

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

johnsoncontrols istar ultra lt firmware UPGRADE

Affected: >= 6.8.6 and < 6.9.2 · 6.9.2

Fixed in: 6.9.2

Safe to downgrade to: a release before 6.8.6

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

johnsoncontrols istar ultra g2 firmware UPGRADE

Affected: < 6.9.2 · 6.9.2

Fixed in: 6.9.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

johnsoncontrols edge g2 firmware UPGRADE

Affected: < 6.9.2 · 6.9.2

Fixed in: 6.9.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-3127?

istar ultra firmware: upgrade to 6.9.2; istar ultra lt firmware: upgrade to 6.9.2; istar ultra g2 firmware: upgrade to 6.9.2. Exact commands for each OS are on this page.

Is CVE-2023-3127 being exploited?

CVE-2023-3127 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-3127 affect?

CVE-2023-3127 affects istar ultra firmware, istar ultra lt firmware, istar ultra g2 firmware. Severity is high (CVSS 7.5). An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with administrator rights.

How urgent is CVE-2023-3127?

Priority 38/100. High severity

Related CVEs

CVE-2022-21941 CRITICAL 10.0 UPGRADE All versions of iSTAR Ultra prior to version 6.8.9.CU01 are vulnerable to a command injection that could allow
CVE-2017-17704 HIGH 7.4 UPGRADE A door-unlocking issue was discovered on Software House iStar Ultra devices through 6.5.2.20569 when used in c

References

← Back to latest CVEs