{"cveID":"CVE-2021-44228","vendorProject":"Apache","product":"Log4j2","vulnerabilityName":"Apache Log4j2 Remote Code Execution Vulnerability","dateAdded":"2021-12-10","shortDescription":"Apache Log4j2 contains a vulnerability where JNDI features do not protect against attacker-controlled JNDI-related endpoints, allowing for remote code execution.","requiredAction":"For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.","dueDate":"2021-12-24","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-44228","cwes":["CWE-20","CWE-400","CWE-502"],"year":2021,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2021-44228","technique":"T1190","technique_name_at_mapping":"Exploit Public-Facing Application","mapping_type":"exploitation_technique","capability_group":"code_execution","comments":"This remote code execution vulnerability is exploited through maliciously-crafted requests to a web application. ","references":["https://unit42.paloaltonetworks.com/apache-log4j-vulnerability-cve-2021-44228/"],"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-2021-44228","technique":"T1486","technique_name_at_mapping":"Data Encrypted for Impact","mapping_type":"secondary_impact","capability_group":"code_execution","comments":"CVE-2021-44228, known as Log4Shell, affects Apache’s Log4j library, an open-source logging framework. An actor can exploit this vulnerability by submitting a specially crafted request to a vulnerable system that causes that system to execute arbitrary code. The request allows a cyber actor to take full control over the system. The actor can then steal information, launch ransomware, or conduct other malicious activity.","references":["https://www.microsoft.com/en-us/security/blog/2021/12/11/guidance-for-preventing-detecting-and-hunting-for-cve-2021-44228-log4j-2-exploitation/#attacks","https://www.cisa.gov/sites/default/files/publications/CSRB-Report-on-Log4-July-11-2022_508.pdf","https://www.zdnet.com/article/log4j-flaw-attackers-are-making-thousands-of-attempts-to-exploit-this-severe-vulnerability/","https://www.cisa.gov/news-events/cybersecurity-advisories/aa22-117a"],"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-2021-44228","technique":"T1496","technique_name_at_mapping":"Resource Hijacking","mapping_type":"secondary_impact","capability_group":"code_execution","comments":"CVE-2021-44228, known as Log4Shell, affects Apache’s Log4j library, an open-source logging framework. An actor can exploit this vulnerability by submitting a specially crafted request to a vulnerable system that causes that system to execute arbitrary code. The request allows a cyber actor to take full control over the system. The actor can then steal information, launch ransomware, or conduct other malicious activity.","references":["https://www.microsoft.com/en-us/security/blog/2021/12/11/guidance-for-preventing-detecting-and-hunting-for-cve-2021-44228-log4j-2-exploitation/#attacks","https://www.cisa.gov/sites/default/files/publications/CSRB-Report-on-Log4-July-11-2022_508.pdf","https://www.zdnet.com/article/log4j-flaw-attackers-are-making-thousands-of-attempts-to-exploit-this-severe-vulnerability/","https://www.cisa.gov/news-events/cybersecurity-advisories/aa22-117a"],"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-2021-44228","technique":"T1505.003","technique_name_at_mapping":"Web Shell","mapping_type":"secondary_impact","capability_group":"code_execution","comments":"CVE-2021-44228, known as Log4Shell, affects Apache’s Log4j library, an open-source logging framework. An actor can exploit this vulnerability by submitting a specially crafted request to a vulnerable system that causes that system to execute arbitrary code. The request allows a cyber actor to take full control over the system. The actor can then steal information, launch ransomware, or conduct other malicious activity.","references":["https://www.microsoft.com/en-us/security/blog/2021/12/11/guidance-for-preventing-detecting-and-hunting-for-cve-2021-44228-log4j-2-exploitation/#attacks","https://www.cisa.gov/sites/default/files/publications/CSRB-Report-on-Log4-July-11-2022_508.pdf","https://www.zdnet.com/article/log4j-flaw-attackers-are-making-thousands-of-attempts-to-exploit-this-severe-vulnerability/","https://www.cisa.gov/news-events/cybersecurity-advisories/aa22-117a"],"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-2021-44228","technique":"T1608.001","technique_name_at_mapping":"Upload Malware","mapping_type":"secondary_impact","capability_group":"code_execution","comments":"CVE-2021-44228, known as Log4Shell, affects Apache’s Log4j library, an open-source logging framework. An actor can exploit this vulnerability by submitting a specially crafted request to a vulnerable system that causes that system to execute arbitrary code. The request allows a cyber actor to take full control over the system. The actor can then steal information, launch ransomware, or conduct other malicious activity.","references":["https://www.microsoft.com/en-us/security/blog/2021/12/11/guidance-for-preventing-detecting-and-hunting-for-cve-2021-44228-log4j-2-exploitation/#attacks","https://www.cisa.gov/sites/default/files/publications/CSRB-Report-on-Log4-July-11-2022_508.pdf","https://www.zdnet.com/article/log4j-flaw-attackers-are-making-thousands-of-attempts-to-exploit-this-severe-vulnerability/","https://www.cisa.gov/news-events/cybersecurity-advisories/aa22-117a"],"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":["exploitation_technique"],"sigma_rule_count":149,"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},{"id":"T1496","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Resource Hijacking","name_at_mapping":"Resource Hijacking","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":13,"has_detection_strategy":true},{"id":"T1505.003","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Web Shell","name_at_mapping":"Web Shell","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":35,"has_detection_strategy":true},{"id":"T1608.001","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Upload Malware","name_at_mapping":"Upload Malware","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":0,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","secondary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"partial","sigma_rules_tagged_cve":["3eb91f0a-0060-424a-a676-59f5fdd75610","9be472ed-893c-4ec0-94da-312d2765f654"],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}