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CVE-2023-5871

17
FAUCET Score

CVE-2023-5871 is a denial-of-service vulnerability in libnbd, affecting Red Hat Enterprise Linux and libnbd products. A malicious Network Block Device (NBD) server can exploit this flaw to cause a denial of service on a client system. Rated as medium severity (CVSS 5.3), it has a low attack complexity and requires no user interaction. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.17.4, < 1.18.2CPE matchmatch criteria
cpe:2.3:a:redhat:libnbd:*:*:*:*:*:*:*:*
1.19.1CPE matchmatch criteria
cpe:2.3:a:redhat:libnbd:1.19.1:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.92%
Probability of exploitation in next 30 days
EPSS Percentile
56.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0092 is in the 35th percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: libnbd-0:1.18.1-3.el9
View patch
redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2023-5871Moderate

libnbd: Malicious NBD server may crash libnbd

Oct 31, 2023

References

access.redhat.com / errata/RHSA-2024:2204
access.redhat.com / security/cve/CVE-2023-5871
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
lists.libguestfs.org / archives/list/[email protected]/thread/PFVUCMPFQUDC23JXSCUUPXIGDZ7XCFMD
Mailing ListPatch