CVE-2023-43742
Zultys Mx250 Firmware authentication bypass
- Published8 Dec 2023
Description
An authentication bypass in Zultys MX-SE, MX-SE II, MX-E, MX-Virtual, MX250, and MX30 with firmware versions prior to 17.0.10 patch 17161 and 16.04 patch 16109 allows an unauthenticated attacker to obtain an administrative session via a protection mechanism failure in the authentication function. In normal operation, the Zultys MX Administrator Windows client connects to port 7505 and attempts authentication, submitting the administrator username and password to the server. Upon authentication failure, the server sends a login failure message prompting the client to disconnect. However, if the client ignores the failure message instead and attempts to continue, the server does not forcibly close the connection and processes all subsequent requests from the client as if authentication had been successful.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
Frequently asked
Is CVE-2023-43742 being actively exploited?
CVE-2023-43742 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.92%.
How severe is CVE-2023-43742?
CVE-2023-43742 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.92% probability of exploitation.
Which products are affected by CVE-2023-43742?
Affected products include Zultys Mx250 Firmware, Zultys Mx30 Firmware, Zultys Mx-e Firmware, Zultys Mx-se Firmware, Zultys Mx-se Ii Firmware, and 1 more.
How do I fix CVE-2023-43742?
Upgrade affected software to a fixed version, for example Zultys Mx250 Firmware 17.0.10, Zultys Mx30 Firmware 17.0.10, Zultys Mx-e Firmware 17.0.10 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2023-43742 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.