{"cve":"CVE-2009-4419","nvd":{"published":"2009-12-24T17:30:00.250","modified":"2026-06-16T23:13:37.970","status":"Modified","description":"Intel Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets in the SINIT Authenticated Code Module (ACM), which allows local users to bypass the Trusted Execution Technology protection mechanism and gain privileges by modifying the MCHBAR register to point to an attacker-controlled region, which prevents the SENTER instruction from properly applying VT-d protection while an MLE is being loaded.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-16"],"references":["http://invisiblethingslab.com/resources/misc09/Another%20TXT%20Attack.pdf","http://osvdb.org/61248","http://secunia.com/advisories/37900","http://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00021&languageid=en-fr","http://theinvisiblethings.blogspot.com/2009/12/another-txt-attack.html"],"products":["intel:gm45_chipset","intel:pm45_express_chipset","intel:q35_chipset","intel:q43_express_chipset","intel:q45_chipset"],"source":"nvd","synced_at":"2026-10-19T19:55:32.599380760+00:00"},"epss":{"cve":"CVE-2009-4419","score":0.00427,"percentile":0.37,"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."]}