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Fencer Vulns
medium 5.3

CVE-2023-5871 json

Libnbd: malicious nbd server may crash libnbd

published 2023-11-27 2 y ago modified 2026-11-05 3 d ago also EUVD-2023-58145

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 9 0:1.18.1-3.el9
  • libnbd Debian 14, Debian 13 1.18.1-1

debian advisories DEBIAN-CVE-2023-5871

  • libnbd RHEL 9 1.18.1-3.el9
  • nbdfuse RHEL 9 1.18.1-3.el9
  • ocaml-libnbd RHEL 9 1.18.1-3.el9
  • python3-libnbd RHEL 9 1.18.1-3.el9
  • libnbd-bash-completion RHEL 9 1.18.1-3.el9

red hat advisories RHSA-2024:2204

  • libnbd openSUSE Leap 15.5, openSUSE Leap 15.4 1.18.1-150300.8.18.1

suse advisories SUSE-SU-2023:4463-1

  • libnbd openSUSE Tumbleweed 1.18.1-2.1

opensuse advisories openSUSE-SU-2024:13422-1

  • libnbd AlmaLinux 9 1.18.1-3.el9
  • nbdfuse AlmaLinux 9 1.18.1-3.el9
  • ocaml-libnbd AlmaLinux 9 1.18.1-3.el9
  • python3-libnbd AlmaLinux 9 1.18.1-3.el9
  • libnbd-bash-completion AlmaLinux 9 1.18.1-3.el9

almalinux advisories ALSA-2024:2204

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-5871 updated cvss 5.3

libnbd: Malicious NBD server may crash libnbd

  • Red Hat Enterprise Linux AppStream (v. 9) libnbd 1.18.1-3.el9, nbdfuse 1.18.1-3.el9, python3-libnbd 1.18.1-3.el9, libnbd-bash-completion 1.18.1-3.el9 Red Hat Enterprise Linux CRB (v. 9) ocaml-libnbd 1.18.1-3.el9
    fixed: vendor fix RHSA-2024:2204
  • Red Hat Enterprise Linux 6 libnbd Red Hat Enterprise Linux 7 libnbd Red Hat Enterprise Linux 8 libnbd, nbdfuse, ocaml-libnbd, python3-libnbd, libnbd-bash-completion
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.