{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-41858", "assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "state": "PUBLISHED", "assignerShortName": "vmware", "dateReserved": "2026-04-22T06:22:10.082Z", "datePublished": "2026-06-04T02:10:34.656Z", "dateUpdated": "2026-06-04T02:10:34.656Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d", "shortName": "vmware", "dateUpdated": "2026-06-04T02:10:34.656Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)", "cweId": "CWE-338", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "A network attacker who can estimate VM boot time can reconstruct a small candidate list and recover the Windows Administrator password, defeating the hardening control (confidentiality impact: HIGH; integrity and availability unaffected)."}]}], "affected": [{"vendor": "Cloud Foundry Foundation", "product": "windows-utilities-release", "versions": [{"status": "affected", "version": "0", "lessThan": "0.23.0", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Weak Randomness / Insecure Cryptographic Primitive (CWE-338) in Get-RandomPassword in BOSH-Ecosystem / windows-utilities-release allows a network attacker to estimate VM boot time and reconstruct a small candidate list to recover the Administrator password. The randomize_password job exists solely to lock the local Administrator account behind an unguessable password as a hardening control. Because the password is derived from a predictable, clock-seeded PRNG, a network attacker who can estimate VM boot time can reconstruct a small candidate list and recover the Administrator password, defeating the hardening control.\n\nAffected versions:\n- windows-utilities-release: all versions prior to v0.23.0 (inclusive); fixed in v0.23.0 or later", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Weak Randomness / Insecure Cryptographic Primitive (CWE-338) in Get-RandomPassword in BOSH-Ecosystem / windows-utilities-release allows a network attacker to estimate VM boot time and reconstruct a small candidate list to recover the Administrator password. The randomize_password job exists solely to lock the local Administrator account behind an unguessable password as a hardening control. Because the password is derived from a predictable, clock-seeded PRNG, a network attacker who can estimate VM boot time can reconstruct a small candidate list and recover the Administrator password, defeating the hardening control.\n\nAffected versions:\n- windows-utilities-release: all versions prior to v0.23.0 (inclusive); fixed in v0.23.0 or later"}]}], "references": [{"url": "https://www.cloudfoundry.org/blog/cve-2026-41858-brute-forceable-windows-admin-creds/"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Weak Randomness / Insecure Cryptographic Primitive (CWE-338) in Get-RandomPassword in BOSH-Ecosystem / windows-utilities-release allows a network attacker to estimate VM boot time and reconstruct a small candidate list to recover the Administrator password. The randomize_password job exists solely to lock the local Administrator account behind an unguessable password as a hardening control. Because the password is derived from a predictable, clock-seeded PRNG, a network attacker who can estimate VM boot time can reconstruct a small candidate list and recover the Administrator password, defeating the hardening control.\n\nAffected versions:\n- windows-utilities-release: all versions prior to v0.23.0 (inclusive); fixed in v0.23.0 or later"}], "id": "CVE-2026-41858", "lastModified": "2026-06-04T03:16:19.790", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security@vmware.com", "type": "Secondary"}]}, "published": "2026-06-04T03:16:19.790", "references": [{"source": "security@vmware.com", "url": "https://www.cloudfoundry.org/blog/cve-2026-41858-brute-forceable-windows-admin-creds/"}], "sourceIdentifier": "security@vmware.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-338"}], "source": "security@vmware.com", "type": "Secondary"}]}

{}

{"created": "2026-06-04T03:30:04.168971+00:00", "title": "Weak Randomness Allows Brute\u2011Force Recovery of Windows Administrator Password", "updated": "2026-06-04T03:30:04.169002+00:00", "vendors": []}