{"cve":"CVE-2009-1542","nvd":{"published":"2009-07-15T15:30:01.420","modified":"2026-06-16T23:07:29.310","status":"Modified","description":"The Virtual Machine Monitor (VMM) in Microsoft Virtual PC 2004 SP1, 2007, and 2007 SP1, and Microsoft Virtual Server 2005 R2 SP1, does not enforce CPU privilege-level requirements for all machine instructions, which allows guest OS users to execute arbitrary kernel-mode code and gain privileges within the guest OS via a crafted application, aka \"Virtual PC and Virtual Server Privileged Instruction Decoding Vulnerability.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-264"],"references":["http://secunia.com/advisories/35808","http://www.securitytracker.com/id?1022544","http://www.us-cert.gov/cas/techalerts/TA09-195A.html","http://www.vupen.com/english/advisories/2009/1890","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-033"],"products":["microsoft:virtual_pc","microsoft:virtual_server"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1542","score":0.07977,"percentile":0.94752,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}