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Vulnerability record · CVE-2018-12242 · published 19 September 2018

CVE-2018-12242: Symantec messaging gateway improper authentication vulnerability

Symantec · Messaging Gateway

The Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to an authentication bypass exploit, which is a type of issue that can allow attackers to potentially circumvent security mechanisms currently in place and gain access to the system or network.

9.8 CVSS 3.0 Critical EPSS 3.0% · top 13.4% CWE-287 · Improper authentication
9.8CVSS 3.0 base score, v2 7.5
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

The Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to an authentication bypass exploit, which is a type of issue that can allow attackers to potentially circumvent security mechanisms currently in place and gain access to the system or network.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/105329 Third Party AdvisoryVDB Entry
https://support.symantec.com/en_US/article.SYMSA1461.html Vendor Advisory
http://www.securityfocus.com/bid/105329 Third Party AdvisoryVDB Entry
https://support.symantec.com/en_US/article.SYMSA1461.html Vendor Advisory

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Related vulnerabilities

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

10.0CVE-2017-6326Symantec Messaging Gateway remote code executionSymantec Messaging Gateway can be exploited to achieve remote code execution, allowing commands to be run on the target machine or within a target pr…EPSS 73%analysed8.8CVE-2018-12243Symantec messaging gateway xml external entity (xxe) vulnerabilityThe Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to a XML external entity (XXE) exploit, which is a type of issue where XML …EPSS 0.77%8.2CVE-2016-2204Symantec messaging gateway injection vulnerabilityThe management console on Symantec Messaging Gateway (SMG) Appliance devices before 10.6.1 allows local users to obtain root-shell access via crafted…EPSS 0.67%7.9CVE-2012-3579Symantec messaging gateway permissions and access controls vulnerabilitySymantec Messaging Gateway (SMG) before 10.0 has a default password for an unspecified account, which makes it easier for remote attackers to obtain …EPSS 40%7.8CVE-2012-6277Ibm domino vulnerabilityMultiple unspecified vulnerabilities in Autonomy KeyView IDOL before 10.16, as used in Symantec Mail Security for Microsoft Exchange before 6.5.8, Sy…EPSS 8.1%7.8CVE-2016-2203Symantec messaging gateway vulnerabilityThe management console on Symantec Messaging Gateway (SMG) Appliance devices before 10.6.1 allows local users to discover an encrypted AD password by…EPSS 7.1%7.7CVE-2012-3580Symantec messaging gateway vulnerabilitySymantec Messaging Gateway (SMG) before 10.0 allows remote authenticated users to modify the web application by leveraging access to the management i…EPSS 1.1%7.3CVE-2019-18379Symantec messaging gateway server-side request forgery (ssrf) vulnerabilitySymantec Messaging Gateway, prior to 10.7.3, may be susceptible to a server-side request forgery (SSRF) exploit, which is a type of issue that can le…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2018-12242), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.