CVE-2023-36847Known exploitationPublic exploitNetwork attack vector

Arbitrary file upload via unauthenticated J-Web handler

Published Aug 17, 2023 · Updated Oct 21, 2025

Missing authentication in J-Web for Junos OS EX Series allows remote attackers to upload arbitrary files through installAppPackage.php. The installAppPackage.php handler accepts a crafted upload request without requiring authentication and writes the supplied file into a restricted filesystem area. Network access to enabled J-Web is sufficient; the direct impact is limited file-system modification, but the upload can be chained with other flaws for code execution.

CVSS severity5.3

Medium

EPSS probability85.77%

Next 30 days · Sep 16, 2026

Known exploitationReported

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2023-36847
Published: Aug 17, 2023
Updated: Oct 21, 2025

Vendor: Juniper Networks
Product: Junos OS
Classifications: CWE-306, T1190

Attack vector: network
Privileges: unauthenticated

Timeline

How it unfolded

Aug 17, 2023CVE publishedPublication date reported by the CVE source.
Nov 13, 2023Exploitation reportedCISA Known Exploited Vulnerabilities entry for CVE-2023-36847
Oct 21, 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.

Affected versionversion=0 <20.4R3-S8
Affected versionversion=21.1 <21.1*
Affected versionversion=21.2 <21.2R3-S6
Affected versionversion=21.3 <21.3R3-S5
Affected versionversion=21.4 <21.4R3-S4
Affected versionversion=22.1 <22.1R3-S3
Affected versionversion=22.2 <22.2R3-S1
Affected versionversion=22.3 <22.3R2-S2, 22.3R3
Affected versionversion=22.4 <22.4R2-S1, 22.4R3

What conditions does exploitation require?

Attack vectornetwork

Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <20.4R3-S8; version=21.1 <21.1*; version=21.2 <21.2R3-S6; version=21.3 <21.3R3-S5; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S3; version=22.2 <22.2R3-S1; version=22.3 <22.3R2-S2, 22.3R3; version=22.4 <22.4R2-S1, 22.4R3

Published CVSS scores

5.3Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitationReported

Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

T1190Exploit Public-Facing Application

Public exploit references

watchTowr Juniper J-Web pre-authentication RCE chainfunctional · demonstrated

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

CISA Known Exploited Vulnerabilities entry for CVE-2023-36847known exploited catalog

Technologies

Your stack

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Your stack

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