Junos OS - RCE (CVE-2023-36844)
161Exploiting 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. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2023-36844. 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 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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