Junos OS - RCE (CVE-2023-36845)
149Exploiting 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.
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. In addition, according to the CrowdSec network, attack volume against CVE-2023-36845 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.
Observed exploitation attempts commonly leverage URLs containing /?phprc=/dev/fd/0.
Exploitation
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Protection
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Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
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