Junos OS - RCE (CVE-2023-36845)
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 remotely execute code.
psychologyCrowdSec Analysis
CVE-2023-36845 is a critical vulnerability impacting the J-Web interface of Juniper Networks Junos OS, allowing unauthenticated remote code execution through a crafted PHP environment variable modification.
CrowdSec has been tracking this vulnerability and its exploits since 1st of April 2025.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2023-36845 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2023-36845. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.
Observed exploitation attempts commonly leverage URLs containing /?phprc=/dev/fd/0.
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| Event | Date |
|---|---|
| CVE Published | 2023-08-17 |
| CISA KEV | 2023-11-13 |
| CISA Remediation Deadline | 2023-11-17 |
| Rule Released | 2025-04-01 |
| CrowdSec First Seen | 2025-04-02 |