CrowdSec
5/10CrowdSec Score

Junos OS - RCE (CVE-2023-36845)

Published on17-08-2023
First seen on02-04-2025

91Exploiting IPs reported

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.

CrowdSec 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.

Data from the CrowdSec community indicates that exploitation of CVE-2023-36845 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2023-36845 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Observed exploitation attempts commonly leverage URLs containing /?phprc=/dev/fd/0.

Exploitation

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Detected IPs

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Protection

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Blocklist

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