CVE-2019-19752Public exploitNetwork attack vector

Server impersonation via shared SSH host keys

Published Apr 30, 2024 · Updated Mar 25, 2025

Hard-coded SSH host keys in fullzero nvOC 3.2 and earlier allow man-in-the-middle attackers to impersonate mining rigs over SSH. The installation image pre-generates and distributes the same SSH host key pair instead of creating a unique identity on each system. Exploitation requires a position in the SSH connection path; the shared key enables server impersonation and fingerprint-based discovery of exposed nvOC hosts.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded SSH host keys in fullzero nvOC 3.2 and earlier allow man-in-the-middle attackers to impersonate mining rigs over SSH. The installation image pre-generates and distributes the same SSH host key pair instead of creating a unique identity on each system. Exploitation requires a position in the SSH connection path; the shared key enables server impersonation and fingerprint-based discovery of exposed nvOC hosts.

The record

CVE
CVE-2019-19752
Published
Apr 30, 2024
Updated
Mar 25, 2025
Vendor
fullzero
Product
nvOC
Classifications
CWE-321, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2025Record 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=3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

fullzero · nvOCversion=3.2

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-321Use of Hard-coded Cryptographic Key
T1557Adversary-in-the-Middle

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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