VDB-124257 · CVE-2018-12243 · BID 105330

Symantec Messaging Gateway up to 10.6.5 XML Parser xml external entity reference

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability, which was classified as critical, was found in Symantec Messaging Gateway up to 10.6.5. This affects an unknown function of the component XML Parser. The manipulation with an unknown input leads to a xml external entity reference vulnerability. CWE is classifying the issue as CWE-611. The software processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 09/12/2018. The weakness was disclosed 09/19/2018 by Alex (Website). The advisory is shared at support.symantec.com. This vulnerability is uniquely identified as CVE-2018-12243 since 06/12/2018. The exploitability is told to be easy. The attack needs to approached within the local network. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 117614 (Symantec Messaging Gateway 10.x < 10.6.6 Multiple Vulnerabilities (SYMSA1461)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context remote. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13317 (Symantec Messaging Gateway Multiple Vulnerabilities (SYMSA1461)).

Upgrading to version 10.6.6 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117614). The entry 124256 is pretty similar.





  • commercial

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Xml external entity reference
CWE: CWE-611 / CWE-610
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 117614
Nessus Name: Symantec Messaging Gateway 10.x < 10.6.6 Multiple Vulnerabilities (SYMSA1461)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Messaging Gateway 10.6.6


06/12/2018 🔍
09/12/2018 +92 days 🔍
09/12/2018 +0 days 🔍
09/19/2018 +6 days 🔍
09/19/2018 +0 days 🔍
09/19/2018 +0 days 🔍
09/20/2018 +1 days 🔍
09/20/2018 +0 days 🔍
03/25/2020 +552 days 🔍


Vendor: symantec.com

Advisory: support.symantec.com
Researcher: Alex
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12243 (🔍)
SecurityFocus: 105330 - Symantec Messaging Gateway CVE-2018-12243 XML External Entity Injection Vulnerability

See also: 🔍


Created: 09/20/2018 08:16 AM
Updated: 03/25/2020 11:36 AM
Changes: 09/20/2018 08:16 AM (69), 03/25/2020 11:36 AM (6)
Complete: 🔍


No comments yet. Languages: en.

Please log in to comment.

Might our Artificial Intelligence support you?

Check our Alexa App!