How severe is CVE-2023-3127?

CVE-2023-3127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2023-3127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3127?

CVE-2023-3127 primarily affects Johnsoncontrols Istar Ultra Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3127?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-3127 published?

CVE-2023-3127 was published on 2023-07-11 and last updated on 2026-06-17.

CVE-2023-3127

CVE-2023-3127 is a high-severity vulnerability in Johnsoncontrols Istar Ultra Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Johnsoncontrols Istar Ultra Firmware
Published: 2023-07-11
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2023-3127?: An unauthenticated user could log into iSTAR Ultra, iSTAR Ultra LT, iSTAR Ultra G2, and iSTAR Edge G2 with administrator rights.
How severe is CVE-2023-3127?: CVE-2023-3127 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2023-3127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3127?: CVE-2023-3127 primarily affects Johnsoncontrols Istar Ultra Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3127?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-3127 published?: CVE-2023-3127 was published on 2023-07-11 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:johnsoncontrols:istar_ultra_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:istar_ultra_firmware:6.9.2:-:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:istar_ultra_lt_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:istar_ultra_lt_firmware:6.9.2:-:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:istar_ultra_g2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:istar_ultra_g2_firmware:6.9.2:-:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:edge_g2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:johnsoncontrols:edge_g2_firmware:6.9.2:-:*:*:*:*:*:*

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