CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability

Required action (CISA's text)

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

Description (NVD)

Juniper Junos OS on EX Series and SRX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control an important environment variable. Using a crafted request, which sets the variable PHPRC, an attacker is able to modify the PHP execution environment allowing the injection und execution of code.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other Juniper flaws

• CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability
• CVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
• CVE-2023-36851: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
• CVE-2023-36847: Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability
• CVE-2023-36846: Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.