{"schema":"threatline.record/2","record":{"id":"CVE-2024-21413","aliases":[],"summary":"Microsoft Outlook Improper Input Validation Vulnerability","details":"Microsoft Outlook contains an improper input validation vulnerability that allows for remote code execution. Successful exploitation of this vulnerability would allow an attacker to bypass the Office Protected View and open in editing mode rather than protected mode.","categories":["Applications & CMS"],"product":"Office Outlook","vendor":"Microsoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","source_modified_at":"2026-08-10T17:52:40.126Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft 365 Apps for Enterprise","vendor":"Microsoft","versions":[{"version":"16.0.1","lessThan":"https://aka.ms/OfficeSecurityReleases","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","source_modified_at":"2026-08-10T17:52:40.126Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft Office 2016","vendor":"Microsoft","versions":[{"version":"16.0.0","lessThan":"16.0.5435.1001","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","source_modified_at":"2026-08-10T17:52:40.126Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft Office 2019","vendor":"Microsoft","versions":[{"version":"19.0.0","lessThan":"https://aka.ms/OfficeSecurityReleases","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","source_modified_at":"2026-08-10T17:52:40.126Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft Office LTSC 2021","vendor":"Microsoft","versions":[{"version":"16.0.1","lessThan":"https://aka.ms/OfficeSecurityReleases","versionType":"custom","status":"affected"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","source_modified_at":"2026-08-10T17:52:40.126Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Microsoft Office 2016","ecosystem":null},"version":"16.0.5435.1001","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2025-02-06","due_date":"2025-02-27","required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.9466,"percentile":0.99859,"score_date":"2026-10-23"},"published_at":"2024-02-13T18:02:24.799Z","modified_at":"2026-08-10T17:52:40.126Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2024-21413","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-08-10T17:52:40.126Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2024-21413","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413","tags":["vendor-advisory","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21413","source":"CISA KEV"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21413","tags":["government-resource"]},{"source":"CVE List","url":"https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-mitigation-script"},{"source":"CVE List","url":"https://www.vicarius.io/vsociety/posts/cve-2024-21413-critical-monikerlink-vulnerability-affecting-microsoft-outlook-detection-script"},{"source":"CVE List","url":"https://research.checkpoint.com/2024/the-risks-of-the-monikerlink-bug-in-microsoft-outlook-and-the-big-picture/","tags":["x_transferred"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2025-02-07T04:55:29.467185Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-08-10T17:52:40.126Z","content_hash":"32dc34cc5f4d92e9712b4fef88b2e7a0c6398b2a02c48e940c1e2b5b2438b89b"}}