{"cveID":"CVE-2023-34048","vendorProject":"VMware","product":"vCenter Server","vulnerabilityName":"VMware vCenter Server Out-of-Bounds Write Vulnerability","dateAdded":"2024-01-22","shortDescription":"VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol that allows an attacker to conduct remote code execution.","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","dueDate":"2024-02-12","knownRansomwareCampaignUse":"Unknown","notes":"https://www.vmware.com/security/advisories/VMSA-2023-0023.html;  https://nvd.nist.gov/vuln/detail/CVE-2023-34048","cwes":["CWE-787"],"year":2023,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2023-34048","technique":"T1203","technique_name_at_mapping":"Exploitation for Client Execution","mapping_type":"primary_impact","capability_group":"oob","comments":"This vulnerability is exploited by an adversary who has already gained network access to the vCenter Server. The adversary sends a crafted payload to the server that has a vulnerable DCERPC protocol and causes an out-of-bounds write on the jmp rax instruction. Adversary group UNC3886 has been attributed to leveraging this vulnerability in the wild to establish a backdoor in victim vCenter servers. ","references":["https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server","https://cloud.google.com/blog/topics/threat-intelligence/chinese-vmware-exploitation-since-2021/"],"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-2023-34048","technique":"T1588.001","technique_name_at_mapping":"Malware","mapping_type":"secondary_impact","capability_group":"oob","comments":"This vulnerability is exploited by an adversary who has already gained network access to the vCenter Server. The adversary sends a crafted payload to the server that has a vulnerable DCERPC protocol and causes an out-of-bounds write on the jmp rax instruction. Adversary group UNC3886 has been attributed to leveraging this vulnerability in the wild to establish a backdoor in victim vCenter servers. ","references":["https://www.vicarius.io/vsociety/posts/understanding-cve-2023-34048-a-zero-day-out-of-bound-write-in-vcenter-server","https://cloud.google.com/blog/topics/threat-intelligence/chinese-vmware-exploitation-since-2021/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"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":["primary_impact"],"sigma_rule_count":35,"has_detection_strategy":true},{"id":"T1588.001","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Malware","name_at_mapping":"Malware","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":1,"has_detection_strategy":true}],"mapping_types":["primary_impact","secondary_impact"],"has_exploitation_technique":false,"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"}