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McAfee Security Bulletin: Email Gateway 7.6 update fixes cross-site scripting (XSS) vulnerability (CVE-2016-3969)
Security Bulletins ID:   SB10153
Last Modified:  5/16/2017


First Published: 3/30/2016
 Impact of Vulnerability:  Cross-Site Scripting (XSS) (CWE-79)
 CVE Numbers:  CVE-2016-3969
 Severity Rating:  Medium
 CVSS v3 Base / Temporal Scores:  6.4 / 5.5
 Recommendations:  Install or update to Email Gateway (MEG) 7.6.404
 Security Bulletin Replacement:  None
 Affected Software:  MEG 7.6
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:


McAfee Email Gateway is vulnerable to cross-site scripting (XSS) in the generation of HTML email alerts using SMTP.
This issue is encountered when File Filtering is enabled with the action set to ESERVICES:REPLACE. With this configuration, when an email with an attachment is blocked and replaced with an alert, the corresponding alert displays the email attachment "as is" without it being XML/HTML escaped.
Cross-site scripting (XSS) vulnerability in McAfee Email Gateway (MEG) 7.6.x before 7.6.404, when File Filtering is enabled with the action set to ESERVICES:REPLACE, allows remote attackers to inject arbitrary web script or HTML via an attachment in a blocked email.
Affected Component:
  • Email Gateway 7.6


Go to the Product Downloads site and download the applicable product patch/hotfix files:
Product Type Version File Name Release Date
MEG 7.6 Patch 7.6.404 MEG-7.6.404-3328.101.zip March 30, 2016

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, security updates, patches, and hotfixes. Review the Release Notes and the Installation Guide, which you can download from the Documentation tab, for instructions on how to install these updates.


None. McAfee strongly recommends that you install the available patch.


No vulnerability detection signatures are available.


McAfee credits Wesley Neelen from DearBytes B.V. for reporting this flaw.

Frequently Asked Questions (FAQs)

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What is CVSS?
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council’s effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, please visit the CVSS website at: http://www.first.org/cvss/.

When calculating CVSS scores, McAfee has adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by successful exploitation of the issue being scored
What are the CVSS scoring metrics that have been used?
CVSS v3.0 Scoring:
 Base Score 6.4
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) None (N)
 User Interaction (UI) Required (R)
 Scope (S) Changed (C)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) None (N)
 Temporal Score (Overall) 5.5
 Exploitability (E) Proof-of-Concept (P)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.

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