Actively exploited in the wild
Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
Juniper — Junos OS · Listed in the CISA KEV since 2023-11-13. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CVE-2023-36845
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile — higher than 100% of all known CVEs
Summary
CVE-2023-36845 is a PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS that allows an unauthenticated, network-based attacker to remotely execute code by modifying the PHPRC variable. This enables code injection and execution in the PHP execution environment.
Risk Assessment
This vulnerability poses a significant risk to organizations as it allows for remote code execution, potentially leading to system takeover. An attacker could exploit this flaw to deploy malware or steal data.
Recommendation
It is recommended to update Junos OS to a version that is not vulnerable to this issue, specifically to version 20.4R3-S9 or later. Additionally, network traffic should be monitored for potential attack attempts.
Original NVD description (English source)
A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to remotely execute code. 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. This issue affects Juniper Networks Junos OS on EX Series and SRX 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 22.3R2-S2, 22.3R3-S1; * 22.4 versions prior to 22.4R2-S1, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.