{"cve":"CVE-2009-1491","nvd":{"published":"2009-05-05T19:30:00.203","modified":"2026-06-16T23:07:22.830","status":"Modified","description":"McAfee GroupShield for Microsoft Exchange on Exchange Server 2000, and possibly other anti-virus or anti-spam products from McAfee or other vendors, does not scan X- headers for malicious content, which allows remote attackers to bypass virus detection via a crafted message, as demonstrated by a message with an X-Testing header and no message body.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://www.nmrc.org/~thegnome/blog/apr09/","https://exchange.xforce.ibmcloud.com/vulnerabilities/50354","http://www.nmrc.org/~thegnome/blog/apr09/","https://exchange.xforce.ibmcloud.com/vulnerabilities/50354"],"products":["mcafee:groupshield"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1491","score":0.02818,"percentile":0.86558,"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."]}