Is CVE-2023-40256 actively exploited?

No active exploitation of CVE-2023-40256 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40256 be exploited remotely?

Yes. CVE-2023-40256 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-40256?

CVE-2023-40256 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2023-40256

CRITICAL

CVE-2023-40256

CWE-295Published: August 11, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A vulnerability was discovered in Veritas NetBackup Snapshot Manager before 10.2.0.1 that allowed untrusted clients to interact with the RabbitMQ service. This was caused by improper validation of the client certificate due to misconfiguration of the RabbitMQ service. Exploiting this impacts the confidentiality and integrity of messages controlling the backup and restore jobs, and could result in the service becoming unavailable. This impacts only the jobs controlling the backup and restore activities, and does not allow access to (or deletion of) the backup snapshot data itself. This vulnerability is confined to the NetBackup Snapshot Manager feature and does not impact the RabbitMQ instance on the NetBackup primary servers.

NVD Source

Technical Analysis

CVE-2023-40256 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.