{"cveID":"CVE-2023-36844","vendorProject":"Juniper","product":"Junos OS","vulnerabilityName":"Juniper Junos OS EX Series PHP External Variable Modification Vulnerability","dateAdded":"2023-11-13","shortDescription":"Juniper Junos OS on EX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables, leading to partial loss of integrity, which may allow chaining to other vulnerabilities.","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","dueDate":"2023-11-17","knownRansomwareCampaignUse":"Unknown","notes":"https://supportportal.juniper.net/s/article/2023-08-Out-of-Cycle-Security-Bulletin-Junos-OS-SRX-Series-and-EX-Series-Multiple-vulnerabilities-in-J-Web-can-be-combined-to-allow-a-preAuth-Remote-Code-Execution?language=en_US ;  https://nvd.nist.gov/vuln/detail/CVE-2023-36844","cwes":["CWE-473"],"year":2023,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2023-36844","technique":"T1203","technique_name_at_mapping":"Exploitation for Client Execution","mapping_type":"exploitation_technique","capability_group":"other","comments":"This vulnerability is exploited through a PHP External Variable Modification flaw in the J-Web component of Juniper Networks Junos OS on EX Series devices. Attackers first use this vulnerability to gain control over certain environment variables by sending a crafted request, which allows them to manipulate these variables without authentication.","references":["https://socradar.io/rapid-reset-ddos-attacks-rise-october-2023-patch-tuesday-has-arrived-cve-2023-36563-cve-2023-41763-cve-2023-44487/","https://labs.watchtowr.com/cve-2023-36844-and-friends-rce-in-juniper-firewalls/","https://www.twingate.com/blog/tips/cve-2023-36844"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2023-36844","technique":"T1190","technique_name_at_mapping":"Exploit Public-Facing Application","mapping_type":"primary_impact","capability_group":"other","comments":"This vulnerability is exploited through a PHP External Variable Modification flaw in the J-Web component of Juniper Networks Junos OS on EX Series devices. Attackers first use this vulnerability to gain control over certain environment variables by sending a crafted request, which allows them to manipulate these variables without authentication.","references":["https://labs.watchtowr.com/cve-2023-36844-and-friends-rce-in-juniper-firewalls/","https://www.twingate.com/blog/tips/cve-2023-36844"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1190","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exploit Public-Facing Application","name_at_mapping":"Exploit Public-Facing Application","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":149,"has_detection_strategy":true},{"id":"T1203","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exploitation for Client Execution","name_at_mapping":"Exploitation for Client Execution","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":35,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-24 19:45 UTC","_attack_version":"19.2"}