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CVE Record

CVE-2018-18366: Symantec Norton Security prior to 22.16.3, SEP (Windows client) prior to and including 12.1 RU6 MP9, and pr...

Symantec Norton Security prior to 22.16.3, SEP (Windows client) prior to and including 12.1 RU6 MP9, and prior to 14.2 RU1, SEP SBE prior to Cloud Agent 3.00.31.2817, NIS-22.15.2.22, SEP-12.1.7484.7002 and SEP Cloud prior to 22.16.3 may be susceptible to a kernel memory disclosure, which is a type of issue where a specially crafted IRP request can cause the driver to return uninitialized memory.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This CVE affects several older Symantec/Norton endpoint security products. A vulnerable Windows driver can return uninitialized kernel memory when it receives a specially crafted IRP request, potentially exposing data that should stay private. The bundle provides no CVSS score and no evidence of active exploitation. Exposure is most likely on Windows endpoints running the listed vulnerable Symantec/Norton clients or cloud agents. The source bundle does not identify server-side exposure, remote network reachability, or affected non-Windows clients. Treat this as a targeted remediation item for legacy endpoint security clients, not an emergency based on available evidence. Prioritize systems with older SEP or Norton builds, especially shared workstations and environments with less trusted local users. Mitigation focus: Upgrade affected products to vendor-fixed builds identified in Symantec advisory SYMSA1479.; Remove or upgrade SEP 12.1 Windows clients through 12.1 RU6 MP9.; Update Norton Security and SEP Cloud clients to 22.16.3 or later..

Prepared

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-2018-18366 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Symantec CorporationNorton SecurityPrior to 22.16.3Listed
Symantec CorporationSEP (Windows client)Prior to and including 12.1 RU6 MP9, Prior to 14.2 RU1Listed
Symantec CorporationSEP SBEPrior to Cloud Agent 3.00.31.2817, NIS-22.15.2.22, SEP-12.1.7484.7002Listed
Symantec CorporationSEP CloudPrior to 22.16.3Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.