Evidence dossier

CVE-2023-36844

Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables

72.3–87.3Priority evidence range

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

Normalized restatement

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.

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 EPSS90.97%

2026-07-18 · v2026.06.15 · percentile 99.8%

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 PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables

Jul 19, 2026Original evidence ↗

CISA KEVoriginal assertion

observed_exploitation

Juniper Junos OS EX Series PHP External Variable Modification Vulnerability

Jul 19, 2026Original evidence ↗

FIRST EPSSoriginal assertion

model_probability

Probability 0.909660000000; percentile 0.997960000000

Jul 19, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

Juniper NetworksJunos OS

[{"status": "affected", "version": "0", "lessThan": "20.4R3-S9", "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-S5", "versionType": "semver"}, {"status": "affected", "version": "22.1", "lessThan": "22.1R3-S4", "versionType": "semver"}, {"status": "affected", "version": "22.2", "lessThan": "22.2R3-S2", "versionType": "semver"}, {"status": "affected", "version": "22.3", "lessThan": "22.3R3-S1", "versionType": "semver"}, {"status": "affected", "version": "22.4", "lessThan": "22.4R2-S2, 22.4R3", "versionType": "semver"}, {"status": "affected", "version": "23.2", "lessThan": "23.2R1-S1, 23.2R2", "versionType": "semver"}]

unknown