{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21537", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2025-12-30T18:10:54.848Z", "datePublished": "2026-02-10T17:51:32.870Z", "dateUpdated": "2026-02-11T01:14:58.679Z"}, "containers": {"cna": {"title": "Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability", "datePublic": "2026-02-10T08:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:defender_for_endpoint:*:*:*:*:*:*:*:*", "versionStartIncluding": "101.0.0", "versionEndExcluding": "1.0.9.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Defender for Endpoint for Linux", "versions": [{"version": "101.0.0", "lessThan": "1.0.9.0", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-94: Improper Control of Generation of Code ('Code Injection')", "lang": "en-US", "type": "CWE", "cweId": "CWE-94"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-02-11T01:14:58.679Z"}, "references": [{"name": "Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network."}], "id": "CVE-2026-21537", "lastModified": "2026-02-10T21:51:48.077", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-02-10T18:16:35.970", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "secure@microsoft.com", "type": "Primary"}]}

{}

{"created": "2026-02-10T21:33:45.190312+00:00", "updated": "2026-02-10T21:33:45.190378+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$defender_for_endpoint"]}