CVE-2026-33784Network attack vector

Unauthenticated device takeover via unchanged default password

Published Apr 9, 2026 · Updated Apr 9, 2026

Use of a default password in Juniper Networks Virtual Lightweight Collector before 3.0.94 allows remote attackers to take full control. Provisioning leaves the high-privileged jsiuser account on its shipped password because no password change is enforced. Access to SSH on the management interface is sufficient to authenticate as that account and control the appliance without prior credentials.

CVSS severity9.3
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of a default password in Juniper Networks Virtual Lightweight Collector before 3.0.94 allows remote attackers to take full control. Provisioning leaves the high-privileged jsiuser account on its shipped password because no password change is enforced. Access to SSH on the management interface is sufficient to authenticate as that account and control the appliance without prior credentials.

The record

CVE
CVE-2026-33784
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Juniper Networks
Product
Virtual Lightweight Collector
Classifications
CWE-1393, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record 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=0 <3.0.94

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Virtual Lightweight Collectorversion=0 <3.0.94

Published CVSS scores

9.3Juniper NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L
9.8Juniper NetworksCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1393Use of Default Password
T1078.001Default Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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