CVE-2018-12243: Symantec Corporation Symantec Messaging Gateway…

CVE-2018-12243: The Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to a XML external entity (XXE) ex...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 20:21 UTC (UTC+00:00)

Security readout for executives and security teams

Symantec Messaging Gateway before 10.6.6 may let crafted XML cause the appliance to read files it should not expose. The sources do not provide severity, CVSS, or exploitation evidence, so urgency depends on whether the organization still runs this older product version. Exposure is most likely in organizations still operating Symantec Messaging Gateway versions earlier than 10.6.6. The source bundle does not identify a specific interface, required privileges, or whether exposure depends on internet reachability. Prioritize confirmation of legacy Symantec Messaging Gateway exposure. If any pre-10.6.6 instance remains in production, schedule remediation because the flaw may expose sensitive local files, but current sources do not justify emergency response without confirmed exposure. Mitigation focus: Inventory Symantec Messaging Gateway deployments and record exact versions.; Upgrade versions earlier than 10.6.6 to a non-affected release.; Review Symantec advisory SYMSA1461 for supported remediation guidance..

Prepared: Jun 7, 2026, 05:35 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2018-12243 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 19, 2018, 15:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://support.symantec.com/en_US/article.SYMSA1461.htmlCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

Symantec CorporationSymantec Messaging GatewayPrior to 10.6.6Listed

Weakness

CWE details

No CWE listed

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