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Vulnerability record · CVE-2005-3377 · published 30 October 2005

CVE-2005-3377: Mcafee internet security suite vulnerability

MMcafee · Internet Security Suite

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."

5.1 CVSS 2.0 Medium EPSS 1.3% · top 30.4%
5.1CVSS 2.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

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."

AV:N/AC:H/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://marc.info/?l=bugtraq&m=113026417802703&w=2
http://www.securityelf.org/magicbyte.html
http://www.securityelf.org/magicbyteadv.html Vendor Advisory
http://www.securityelf.org/updmagic.html
http://www.securityfocus.com/bid/15189
http://marc.info/?l=bugtraq&m=113026417802703&w=2
http://www.securityelf.org/magicbyte.html
http://www.securityelf.org/magicbyteadv.html Vendor Advisory
http://www.securityelf.org/updmagic.html
http://www.securityfocus.com/bid/15189

Track CVE-2005-3377 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.6CVE-2009-1348Mcafee active virus defense improper input validation vulnerabilityThe AV engine before DAT 5600 in McAfee VirusScan, Total Protection, Internet Security, SecurityShield for Microsoft ISA Server, Security for Microso…EPSS 2.8%7.2CVE-2005-1107Mcafee internet security suite vulnerabilityMcAfee Internet Security Suite 2005 uses insecure default ACLs for installed files, which allows local users to gain privileges or disable protection…EPSS 0.34%6.8CVE-2006-3961Mcafee antispyware memory buffer overflow vulnerabilityBuffer overflow in McSubMgr ActiveX control (mcsubmgr.dll) in McAfee Security Center 6.0.23 for Internet Security Suite 2006, Wireless Home Network S…EPSS 34%5.0CVE-2006-5417Mcafee internet security suite vulnerabilityMcAfee Network Agent (mcnasvc.exe) 1.0.178.0, as used by multiple McAfee products possibly including Internet Security Suite, Personal Firewall Plus,…EPSS 1.8%

Source: NIST National Vulnerability Database (record CVE-2005-3377), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.