{"cveID":"CVE-2021-41379","vendorProject":"Microsoft","product":"Windows","vulnerabilityName":"Microsoft Windows Installer Privilege Escalation Vulnerability","dateAdded":"2022-03-03","shortDescription":"Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-03-17","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-41379","cwes":["CWE-1386"],"year":2021,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2021-41379","technique":"T1078","technique_name_at_mapping":"Valid Accounts","mapping_type":"exploitation_technique","capability_group":"priv_escalation","comments":"The vulnerability in Microsoft Windows allows local attackers to escalate privileges by exploiting a flaw in the Windows Installer service. By creating a junction, attackers can delete targeted files or directories, potentially executing arbitrary code with SYSTEM privileges. However, attackers must already have access and the ability to execute low-privileged code on the target system to exploit this vulnerability.\n\nThis vulnerability has been identified as exploited in the wild; however, specific details on how the vulnerability was exploited have not been publicly released. ","references":["https://threatpost.com/attackers-target-windows-installer-bug/176558/","https://intel471.com/blog/installerfiletakeover-exploit-cve-2021-41379","https://www.zerodayinitiative.com/advisories/ZDI-21-1308/","https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-41379"],"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-2021-41379","technique":"T1068","technique_name_at_mapping":"Exploitation for Privilege Escalation","mapping_type":"primary_impact","capability_group":"priv_escalation","comments":"The vulnerability in Microsoft Windows allows local attackers to escalate privileges by exploiting a flaw in the Windows Installer service. By creating a junction, attackers can delete targeted files or directories, potentially executing arbitrary code with SYSTEM privileges. However, attackers must already have access and the ability to execute low-privileged code on the target system to exploit this vulnerability.\n\nThis vulnerability has been identified as exploited in the wild; however, specific details on how the vulnerability was exploited have not been publicly released. ","references":["https://threatpost.com/attackers-target-windows-installer-bug/176558/","https://intel471.com/blog/installerfiletakeover-exploit-cve-2021-41379","https://www.zerodayinitiative.com/advisories/ZDI-21-1308/","https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-41379"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1068","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exploitation for Privilege Escalation","name_at_mapping":"Exploitation for Privilege Escalation","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":31,"has_detection_strategy":true},{"id":"T1078","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Valid Accounts","name_at_mapping":"Valid Accounts","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":56,"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":["af8bbce4-f751-46b4-8d91-82a33a736f61"],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}