How severe is CVE-2023-26597?

CVE-2023-26597 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-26597 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26597?

CVE-2023-26597 affects Honeywell C300 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26597?

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-2023-26597 published?

CVE-2023-26597 was published on 2023-07-13 and last updated on 2026-06-17.

CVE-2023-26597

CVE-2023-26597 is a high-severity vulnerability in Honeywell C300 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Honeywell C300 Firmware
Published: 2023-07-13
Last modified: 2026-06-17

Description

Controller DoS due to buffer overflow in the handling of a specially crafted message received by the controller. See Honeywell Security Notification for recommendations on upgrading and versioning. See Honeywell Security Notification for recommendations on upgrading and versioning.

Frequently asked questions

What is CVE-2023-26597?: Controller DoS due to buffer overflow in the handling of a specially crafted message received by the controller. See Honeywell Security Notification for recommendations on upgrading and versioning. See Honeywell Security Notification for recommendations on upgrading and versioning.
How severe is CVE-2023-26597?: CVE-2023-26597 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-26597 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26597?: CVE-2023-26597 affects Honeywell C300 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26597?: 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-2023-26597 published?: CVE-2023-26597 was published on 2023-07-13 and last updated on 2026-06-17.

References

https://process.honeywell.com

Affected products (1)

cpe:2.3:o:honeywell:c300_firmware:*:*:*:*:*:*:*:*

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