{"cveID":"CVE-2021-45046","vendorProject":"Apache","product":"Log4j2","vulnerabilityName":"Apache Log4j2 Deserialization of Untrusted Data Vulnerability","dateAdded":"2023-05-01","shortDescription":"Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2023-05-22","knownRansomwareCampaignUse":"Known","notes":"https://logging.apache.org/log4j/2.x/security.html; https://nvd.nist.gov/vuln/detail/CVE-2021-45046","cwes":["CWE-917"],"year":2021,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2021-45046","technique":"T1059","technique_name_at_mapping":"Command and Scripting Interpreter","mapping_type":"primary_impact","capability_group":"untrusted_data","comments":"CVE 2021-45046 is a Log4J-related vulnerability that could enable enables an attacker to cause Remote Code Execution or other effects in certain non-default configurations. This specific vulnerability has been reported to have been leveraged in cryptomining and ransomware operations. ","references":["https://blog.cloudflare.com/protection-against-cve-2021-45046-the-additional-log4j-rce-vulnerability/","https://therecord.media/local-governments-allegedly-targeted-with-iranian-drokbk-malware-through-log4j-vulnerability","https://www.cisa.gov/news-events/cybersecurity-advisories/aa21-356a"],"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-2021-45046","technique":"T1486","technique_name_at_mapping":"Data Encrypted for Impact","mapping_type":"secondary_impact","capability_group":"untrusted_data","comments":"CVE 2021-45046 is a Log4J-related vulnerability that has been seen to be used in cryptomining and ransomware operations. ","references":["https://blog.cloudflare.com/protection-against-cve-2021-45046-the-additional-log4j-rce-vulnerability/","https://therecord.media/local-governments-allegedly-targeted-with-iranian-drokbk-malware-through-log4j-vulnerability","https://www.cisa.gov/news-events/cybersecurity-advisories/aa21-356a"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1059","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Command and Scripting Interpreter","name_at_mapping":"Command and Scripting Interpreter","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":95,"has_detection_strategy":true},{"id":"T1486","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Data Encrypted for Impact","name_at_mapping":"Data Encrypted for Impact","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":16,"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":"2026-08-23 05:47 UTC","_attack_version":"19.2"}