CVE-2023-36844 - CVE House
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Status published Medium CVE-2023-36844

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

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • LYS, working with DEVCORE Internship Program

References

More from Juniper Networks

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CVE-2025-6549
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CVE-2025-60011
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CVE-2025-60010
Junos OS and Junos OS Evolved: Device allows login for user with expired password
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CVE-2025-60009
Junos Space: CLI Configlet page is vulnerable to reflected cross-site script injection
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CVE-2025-60007
Junos OS: A specifically crafted 'show chassis' command causes chassisd to crash
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Affected Vendor

Juniper Networks

View all reports →

Affected Software

Junos OS
Vulnerable Versions:
0, 21.1, 21.2, 21.3, 21.4, 22.1, 22.2, 22.3, 22.4, 23.2

Timeline

Official Publish: August 17th, 2023
Last Modified: October 21st, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses (CWE)

CWE-473

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.