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Vulnerabilities

Vulnerability · CVE-2025-43873

Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

Published Dec 17, 2025 · catalog updated Aug 24, 2026 · Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-43873. EPSS is 0.29%. Act only if a listed version of Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Advisory link
Affected products
vendor Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 0 ≤6.9.3

Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 0 ≤6.9.30 ≤6.9.3

How to fix CVE-2025-43873

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-43873. EPSS is 0.29%. Act only if a listed version of Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 is installed.

Which versions are affected?

Compare what you have installed with Johnson Control iSTAR Ultra, iSTAR Ultra SE, iSTAR Ultra G2, iSTAR Ultra G2 SE, iSTAR Edge G2 0 ≤6.9.3 0 ≤6.9.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 17, 2025 · EUVD

    Detected

    Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

  2. Aug 24, 2026 · EUVD

    Updated

    Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

Sources

  • FIRST EPSSExploitation probabilityCVE-2025-43873

    30-day exploitation probability 0.29%

    first.org
  • EUVDVulnerability recordEUVD-2025-203904

    Successful exploitation of these vulnerabilities could allow an attacker to modify firmware and gain full access to the device.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 29, 2026
  • EUVDOct 29, 2026