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CVE-2023-4299

Digi RealPort Protocol Use of Password Hash Instead of Password for Authentication

Critical9.0EPSS 0.68%
Published
Updated
Reserved
Assigned by
icscert

Description

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

Timeline

  1. ID reserved

    By icscert

  2. · 21 days later

    Published

  3. · 17 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-4299, by who scored it
Scored byCVSSScoreVector
icscertCNA (assigner)3.1Critical9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVDNVD · Modified3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.68% · top 47% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.0.

Weakness

Affected products

What to do

Solution: Digi International recommends users acquire and install patches that they have made available for the following products: * ​RealPort software for Windows: Fixed in 4.10.490 * ​Digi ConnectPort TS 8/16: Fixed in firmware version 2.26.2.4 * ​Digi ConnectPort LTS 8/16/32: Fixed in version 1.4.9 * ​Digi Connect ES: Fixed in firmware version 2.26.2.4 ​For more information, see the customer notification document https://www.digi.com/getattachment/resources/security/alerts/realport-cves/Dragos-Disclosure-Statement.pdf  published by Digi International.

Workaround: Dragos recommends restricting access to Digi devices on TCP/771 (default) or TCP/1027 (if encryption is enabled, this is the default port). Only allow the workstations which initiate RealPort connections to communicate to the field equipment on those ports. Note that most of Digi's devices allow you to change the setting for which TCP port the RealPort service runs on, so end users should consult their device configuration and restrict access to the configured port if it is not the default. ​If using the system in 'reverse' mode, where the Digi device calls back to the Windows or Linux workstation, then Dragos recommends restricting access to the workstation on TCP/771 or TCP/1027 to known Digi RealPort devices on your network. This port may be configured by end users, so consult the workstation and device configurations to ensure coverage.

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .