{"cveID":"CVE-2021-21148","vendorProject":"Google","product":"Chromium V8","vulnerabilityName":"Google Chromium V8 Heap Buffer Overflow Vulnerability","dateAdded":"2021-11-03","shortDescription":"Google Chromium V8 Engine contains a heap buffer overflow vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Unknown","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-21148","cwes":["CWE-122"],"year":2021,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2021-21148","technique":"T1059.007","technique_name_at_mapping":"JavaScript","mapping_type":"exploitation_technique","capability_group":"buffer_overflow","comments":"CVE-2021-21148 allows an adversary to use JavaScript to exploit the Chromium browser V8 JavaScript engine which allows for a write into the heap.","references":["https://threatprotect.qualys.com/2021/02/08/google-chrome-heap-buffer-overflow-vulnerability-cve-2021-21148/","https://www.tenable.com/blog/cve-2021-21148-google-chrome-heap-buffer-overflow-vulnerability-exploited-in-the-wild"],"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-2021-21148","technique":"T1203","technique_name_at_mapping":"Exploitation for Client Execution","mapping_type":"primary_impact","capability_group":"buffer_overflow","comments":"CVE-2021-21148 allows an adversary to use JavaScript to exploit the Chromium browser V8 JavaScript engine which allows for a write into the heap.","references":["https://www.tenable.com/blog/cve-2021-21148-google-chrome-heap-buffer-overflow-vulnerability-exploited-in-the-wild","https://threatprotect.qualys.com/2021/02/08/google-chrome-heap-buffer-overflow-vulnerability-cve-2021-21148/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1059.007","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"JavaScript","name_at_mapping":"JavaScript","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":29,"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":["primary_impact"],"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":"2026-08-23 05:47 UTC","_attack_version":"19.2"}