CVE-2019-14851Public exploitNetwork attack vector

Service crash via repeated plugin handle opening

Published Mar 18, 2021 · Updated Aug 5, 2024

Denial of service in nbdkit 1.12.7, 1.14.1, and 1.15.1 allows remote attackers to terminate the server through NBD negotiation. Processing NBD_OPT_INFO before NBD_OPT_GO opens the plugin twice without closing its first handle, triggering an assertion in backend_open. The attacker must reach the NBD service; TLS client authentication restricts the attack to trusted clients, while a successful request exits the process and interrupts all clients.

CVSS severity6.5
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in nbdkit 1.12.7, 1.14.1, and 1.15.1 allows remote attackers to terminate the server through NBD negotiation. Processing NBD_OPT_INFO before NBD_OPT_GO opens the plugin twice without closing its first handle, triggering an assertion in backend_open. The attacker must reach the NBD service; TLS client authentication restricts the attack to trusted clients, while a successful request exits the process and interrupts all clients.

The record

CVE
CVE-2019-14851
Published
Mar 18, 2021
Updated
Aug 5, 2024
Vendor
389 Directory Server
Product
nbdkit
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=nbdkit 1.12.8, nbdkit 1.14.2, nbdkit 1.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

389 Directory Server · nbdkitversion=nbdkit 1.12.8, nbdkit 1.14.2, nbdkit 1.15.2

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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