The 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 input containing a reference to an external entity is processed by a weakly configured XML parser. The attack uses file URI schemes or relative paths in the system identifier to access files that should not normally be accessible.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-12243
• https://support.symantec.com/en_US/article.SYMSA1461.html
• http://www.securityfocus.com/bid/105330