KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2023-36847

Junos OS

Juniper Networks / Junos OS · affected before 20.4R3-S8

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Severity
CVSS 5.3 · Medium
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
85.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-36847 is an unauthenticated vulnerability affecting Juniper Networks Junos OS. A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated,...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Juniper Networks / Junos OS affected before 20.4r3-s8.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Junos OS

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity.

With a specific request to installAppPackage.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of

integrity

for a certain

part of the file system, which may allow chaining to other vulnerabilities.

This issue affects Juniper Networks Junos OS on EX Series:

* All versions prior to 20.4R3-S8; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions

prior to

21.3R3-S5; * 21.4 versions

prior to

21.4R3-S4; * 22.1 versions

prior to

22.1R3-S3; * 22.2 versions

prior to

22.2R3-S1; * 22.3 versions

prior to

22.3R2-S2, 22.3R3; * 22.4 versions

prior to

22.4R2-S1, 22.4R3.

Vendor Product Affected Status
Juniper Networks Junos OS Before 20.4R3-S8 Affected
Juniper Networks Junos OS Before 21.1* Affected
Juniper Networks Junos OS Before 21.2R3-S6 Affected
Juniper Networks Junos OS Before 21.3R3-S5 Affected
Juniper Networks Junos OS Before 21.4R3-S4 Affected
Juniper Networks Junos OS Before 22.1R3-S3 Affected
Juniper Networks Junos OS Before 22.2R3-S1 Affected
Juniper Networks Junos OS Before 22.3R2-S2, 22.3R3 Affected
Juniper Networks Junos OS Before 22.4R2-S1, 22.4R3 Affected
View vendor advisory (opens in new tab)
Published
17 Aug 2023
Exploitation Reported
13 Nov 2023
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nessus_scanner edge cisa php

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 13 Nov 2023

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CISA First 2023-11-13 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nessus https://www.tenable.com/plugins/nessus/180190 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

85.8%

Weaknesses

Missing Authentication for Critical Function CWE-306

Timeline

From disclosure to observed exploitation

  1. Nessus plugin available

    Scanner coverage available

  2. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2023-36847

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2023-36847",
  "confidence": "Confirmed",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.85769,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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