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Vulnerabilities/CVE-2023-36847Public Intelligence Dossier
Source: juniper · Limited verification•Last verified: •Collection Degraded
CVE-2023-36847ListedMEDIUM (raw)CVSS 5.3CWE-306

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

Published: 18 Aug 2023•Last updated: 17 Jun 2026, 11:37 AM IST•Source identifier: sirt@juniper.net
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added13 Nov 2023
Due17 Nov 2023
RansomwareUnknown
CVSS score
5.3MEDIUM (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Metric sourcesirt@juniper.net
EPSS probability
83.5%0.835
Percentile100th
Weakness type
CWE-306
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; Known exploitation signal from CISA KEV or ransomware metadata; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • juniper junos · < 20.4; 20.4; 21.1; 21.2; 21.3; 21.4; 22.1; 22.2; 22.3; 22.4 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:juniper:ex2200:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2200-c:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2200-vc:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-24mp:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-24p:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-24t:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-48mp:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-48p:-:*:*:*:*:*:*:*, cpe:2.3:h:juniper:ex2300-48t:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); authentication-weakness (CWE-306)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Identify affected authentication surfaces and compare versions with the advisory.Telemetry: Application inventory · A CWE match is not proof of local exposure. · Rule authentication-weakness

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review unexpected successful sign-ins and changes to privileged accounts on affected systems.Telemetry: SigninLogs · Access anomalies are relevant to authentication weaknesses. · Rule authentication-weakness

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
13 Nov 2023
Required action due
17 Nov 2023
Known ransomware use
Unknown

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Change History & Source Data

— No recorded material change

CNA / source
sirt@juniper.net
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*, cpe:2.3:o:juniper:junos:20.4:r3-s2:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2023-11-13supportportal.juniper.netSource recordnvd.nist.govSource recordcisa.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2023-36847
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2023-36847
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2023-36847"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.