{"id":"CVE-2023-5871","title":"Libnbd: malicious nbd server may crash libnbd","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.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-617"],"vendor":"Red Hat","product":"libnbd","affected":["libnbd (all versions)","libnbd","libnbd","virt:rhel/libnbd"],"published":"2023-11-27","updated":"2026-11-05","sourceUpdated":"2026-11-05T11:36:23.350Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-5871","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2204","label":"RHSA-2024:2204"},{"url":"https://access.redhat.com/security/cve/CVE-2023-5871"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2247308","label":"RHBZ#2247308"},{"url":"https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/PFVUCMPFQUDC23JXSCUUPXIGDZ7XCFMD/"}],"tags":["cve.org"],"epss":0.01108,"epssPercentile":0.65976,"ingestedAt":"2026-11-05T21:36:00.803Z","slug":"CVE-2023-5871","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `libnbd (all versions)`\n- `libnbd`\n- `libnbd`\n- `virt:rhel/libnbd`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}