What is CVE-2023-4299?

CVE-2023-4299 is a critical-severity vulnerability in Digi Cm, classified under CWE-836. CVSS score: 9.0/10. Published 2023-08-31.

How severe is CVE-2023-4299?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Vulnerability in Digi Cm

CVE-2023-4299

Digi RealPort Protocol is vulnerable to a replay attack that may allow an attacker to bypass authentication to access connected equipment.

Published 2023-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-836

References

www.cisa.gov/news-events/ics-advisories/icsa-23-243-04 (US Government Resource, Third Party Advisory)
www.digi.com/getattachment/resources/security/alerts/realport-cves/Dragos-Discl… (Vendor Advisory)

Frequently asked questions

What is CVE-2023-4299?: CVE-2023-4299 is a critical-severity vulnerability in Digi Cm, classified under CWE-836. CVSS score: 9.0/10. Published 2023-08-31.
How severe is CVE-2023-4299?: Critical severity. CVSS v3 base score is 9.0 out of 10.