CVE-2022-21941: All versions of iSTAR Ultra prior to version 6.8.9.CU01 are vulnerable to a command injection that could allow

Q: How do I fix CVE-2022-21941?

istar ultra firmware: upgrade to 6.8.9.cu01. Exact commands for each OS are on this page.

Q: Is CVE-2022-21941 being exploited?

CVE-2022-21941 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-2022-21941 affect?

CVE-2022-21941 affects istar ultra firmware. Severity is critical (CVSS 10.0). All versions of iSTAR Ultra prior to version 6.8.9.CU01 are vulnerable to a command injection that could allow an unauthenticated user root access to the system.

Q: How urgent is CVE-2022-21941?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2022-21941 is a critical-severity flaw (CVSS 10.0) affecting istar ultra firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All versions of iSTAR Ultra prior to version 6.8.9.CU01 are vulnerable to a command injection that could allow an unauthenticated user root access to the system.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-77
Published	2022-08-31
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

2022-08-31 16:15 UTCPublished CVE record published
2026-06-17 04:27 UTCUpdated Record last modified

johnsoncontrols istar ultra firmware UPGRADE

Affected: < 6.8.9.cu01

Fixed in: 6.8.9.cu01

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-2022-21941?

istar ultra firmware: upgrade to 6.8.9.cu01. Exact commands for each OS are on this page.

Is CVE-2022-21941 being exploited?

CVE-2022-21941 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-2022-21941 affect?

CVE-2022-21941 affects istar ultra firmware. Severity is critical (CVSS 10.0). All versions of iSTAR Ultra prior to version 6.8.9.CU01 are vulnerable to a command injection that could allow an unauthenticated user root access to the system.

How urgent is CVE-2022-21941?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-3127 HIGH 7.5 UPGRADE UPGRADE An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with adm
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