Junos OS - RCE (CVE-2023-36844)
157Exploiting 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 control certain, important environment variables.
CrowdSec analysis
CVE-2023-36844 is a vulnerability in the J-Web interface of Juniper Networks Junos OS, which enables unauthenticated attackers to modify critical environment variables through crafted requests.
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-2023-36844 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2023-36844 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2023-36844 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.
Observed attack patterns are aimed at the /webauth_operation.php endpoint, focusing on systems with publicly exposed interfaces.
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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