Evidence dossier

CVE-2023-36847

Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files

71.7–86.7Priority evidence range

As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State: PUBLISHED
Published: Aug 17, 2023
Updated: Oct 21, 2025
Evidence coverage: 85%

CISA KEVCatalog member

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

FIRST EPSS84.69%

2026-07-18 · v2026.06.15 · percentile 99.7%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment

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CISA ADP Vulnrichment

Jul 19, 2026Original evidence ↗

CVEderivative copy

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CVE Program Container

Jul 19, 2026Original evidence ↗

juniperoriginal assertion

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Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files

Jul 19, 2026Original evidence ↗

CISA KEVoriginal assertion

observed_exploitation

Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability

Jul 19, 2026Original evidence ↗

FIRST EPSSoriginal assertion

model_probability

Probability 0.846920000000; percentile 0.996810000000

Jul 19, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

Juniper NetworksJunos OS

[{"status": "affected", "version": "0", "lessThan": "20.4R3-S8", "versionType": "semver"}, {"status": "affected", "version": "21.1", "lessThan": "21.1*", "versionType": "semver"}, {"status": "affected", "version": "21.2", "lessThan": "21.2R3-S6", "versionType": "semver"}, {"status": "affected", "version": "21.3", "lessThan": "21.3R3-S5", "versionType": "semver"}, {"status": "affected", "version": "21.4", "lessThan": "21.4R3-S4", "versionType": "semver"}, {"status": "affected", "version": "22.1", "lessThan": "22.1R3-S3", "versionType": "semver"}, {"status": "affected", "version": "22.2", "lessThan": "22.2R3-S1", "versionType": "semver"}, {"status": "affected", "version": "22.3", "lessThan": "22.3R2-S2, 22.3R3", "versionType": "semver"}, {"status": "affected", "version": "22.4", "lessThan": "22.4R2-S1, 22.4R3", "versionType": "semver"}]

unknown