Multiple interpretation error in (1) McAfee Internet Security Suite 7.1.5 version 9.1.08 with the 4.4.00 engine and (2) McAfee Corporate 8.0.0 patch 10 with the 4400 engine allows remote attackers to bypass virus scanning via a file such as BAT, HTML, and EML with an "MZ" magic byte sequence which is normally associated with EXE, which causes the file to be treated as a safe type that could still be executed as a dangerous file type by applications on the end system, as demonstrated by a "triple headed" program that contains EXE, EML, and HTML content, aka the "magic byte bug."
Conclusion & alert: CVE-2005-3377 is rated Moderate Risk (41.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.45%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-03-30 | 0.46% | 0.45% | -0.01% |
| 2 | 2025-03-29 | 0.45% | 0.46% | +0.01% |
| 3 | 2025-03-19 | — | 0.45% | — |
Full EPSS history (11 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.1 | 2.0 | MEDIUM |
|
4.9 | 6.4 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mcafee | internet_security_suite | 7.1.5_version_9.1.08_engine_4.4.00 | cpe:2.3:a:mcafee:internet_security_suite:7.1.5_version_9.1.08_engine_4.4.00:*:*:*:*:*:*:* |
| mcafee | internet_security_suite | 8.0.0_patch_10_engine_4400 | cpe:2.3:a:mcafee:internet_security_suite:8.0.0_patch_10_engine_4400:*:*:*:*:*:*:* |