CVE-2023-5871

MediumCVSS 5.3

Published: 27/11/2023(UTC)Updated: 05/11/2026(UTC)Translated: 05/11/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

1.11%

66th percentile - higher than 66% of all known CVEs

Summary

A flaw was found in libnbd, due to a malicious Network Block Device (NBD), a protocol for accessing Block Devices such as hard disks over a Network. This issue may allow a malicious NBD server to cause a Denial of Service.

Risk Assessment

A malicious NBD server can cause a denial of service on the libnbd client, disrupting access to block devices.

Recommendation

Update libnbd to a patched version and connect only to trusted NBD servers.

Other vulnerabilities in libnbd

CVE-2025-14946Medium
A flaw was found in libnbd. A malicious actor could exploit this by convincing libnbd to open a specially crafted URI. This vulnerability arises because non-standard hostnames starting with '-o' are incorrectly interpreted as arguments to the SSH process, rather than as hostnames. This could lead to arbitrary code execution with the privileges of the user running libnbd.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS