How severe is CVE-2026-33784?

CVE-2026-33784 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33784 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33784?

CVE-2026-33784 affects Juniper Virtual Lightweight Collector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33784?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33784 have an EU (EUVD) identifier?

Yes. CVE-2026-33784 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21203.

When was CVE-2026-33784 published?

CVE-2026-33784 was published on 2026-04-09 and last updated on 2026-07-08.

CVE-2026-33784

CVE-2026-33784 is a critical-severity vulnerability in Juniper Virtual Lightweight Collector with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1393.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21203
Weakness: CWE-1393
Affected product: Juniper Virtual Lightweight Collector
Published: 2026-04-09
Last modified: 2026-07-08

Description

A Use of Default Password vulnerability in the Juniper Networks Support Insights (JSI) Virtual Lightweight Collector (vLWC) allows an unauthenticated, network-based attacker to take full control of the device. vLWC software images ship with an initial password for a high privileged account. A change of this password is not enforced during the provisioning of the software, which can make full access to the system by unauthorized actors possible.This issue affects all versions of vLWC before 3.0.94.

Frequently asked questions

What is CVE-2026-33784?: A Use of Default Password vulnerability in the Juniper Networks Support Insights (JSI) Virtual Lightweight Collector (vLWC) allows an unauthenticated, network-based attacker to take full control of the device. vLWC software images ship with an initial password for a high privileged account. A change of this password is not enforced during the provisioning of the software, which can make full access to the system by unauthorized actors possible.This issue affects all versions of vLWC before 3.0.94.
How severe is CVE-2026-33784?: CVE-2026-33784 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33784 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33784?: CVE-2026-33784 affects Juniper Virtual Lightweight Collector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33784?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33784 have an EU (EUVD) identifier?: Yes. CVE-2026-33784 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21203.
When was CVE-2026-33784 published?: CVE-2026-33784 was published on 2026-04-09 and last updated on 2026-07-08.

References

https://kb.juniper.net/JSA107871

Affected products (1)

cpe:2.3:a:juniper:virtual_lightweight_collector:*:*:*:*:*:*:*:*

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