CVE-2018-18366

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.

Published: 2019-04-25 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-18366 is rated Low Risk (36.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.39%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-18366

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.09% 0.39% +0.30%
2 2025-03-30 0.17% 0.09% -0.08%
3 2025-03-29 — 0.17% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-18366

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.0 4.0 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2018-18366

Affected software / configurations for CVE-2018-18366

Vendor Product Version Raw CPE
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:*:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:mr1:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:mr2:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:mr3:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:mr4:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:mr4-mp2:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru5:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru6:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru6-mp1:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru6-mp2:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru6-mp3:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru6a:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru7:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru7-mp1:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru7-mp2:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru7-mp4:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ru7-mp4a:*:*:*:windows:*:*
symantec endpoint_protection 11.0 cpe:2.3:a:symantec:endpoint_protection:11.0:ry7-mp3:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:*:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru1:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru1-mp1:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru2:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru2-mp1:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru3:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru4:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru4-mp1:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru4-mp1a:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru4-mp1b:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru4a:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru5:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp1:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp10:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp2:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp3:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp4:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp5:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp6:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp7:*:*:*:windows:*:*
symantec endpoint_protection 12.1 cpe:2.3:a:symantec:endpoint_protection:12.1:ru6-mp8:*:*:*:windows:*:*
symantec endpoint_protection 14 cpe:2.3:a:symantec:endpoint_protection:14:*:*:*:*:windows:*:*
symantec endpoint_protection 14 cpe:2.3:a:symantec:endpoint_protection:14:mp1:*:*:*:windows:*:*
symantec endpoint_protection 14.0.0 cpe:2.3:a:symantec:endpoint_protection:14.0.0:mp2:*:*:*:windows:*:*
symantec endpoint_protection 14.0.1 cpe:2.3:a:symantec:endpoint_protection:14.0.1:*:*:*:*:windows:*:*
symantec endpoint_protection 14.0.1 cpe:2.3:a:symantec:endpoint_protection:14.0.1:mp1:*:*:*:windows:*:*
symantec endpoint_protection 14.0.1 cpe:2.3:a:symantec:endpoint_protection:14.0.1:mp2:*:*:*:windows:*:*
symantec endpoint_protection 14.2 cpe:2.3:a:symantec:endpoint_protection:14.2:*:*:*:*:windows:*:*
symantec endpoint_protection 14.2 cpe:2.3:a:symantec:endpoint_protection:14.2:mp1:*:*:*:windows:*:*
symantec endpoint_protection nis-22.15.2.22 cpe:2.3:a:symantec:endpoint_protection:nis-22.15.2.22:*:*:*:small_business:*:*:*
symantec endpoint_protection sep-12.1.7484.7002 cpe:2.3:a:symantec:endpoint_protection:sep-12.1.7484.7002:*:*:*:small_business:*:*:*
symantec endpoint_protection_cloud < 22.16.3 cpe:2.3:a:symantec:endpoint_protection_cloud:*:*:*:*:*:*:*:*
symantec endpoint_protection_cloud_agent < 3.00.31.2817 cpe:2.3:a:symantec:endpoint_protection_cloud_agent:*:*:*:*:small_business:*:*:*
symantec norton_security < 22.16.3 cpe:2.3:a:symantec:norton_security:*:*:*:*:*:windows:*:*

References for CVE-2018-18366

cvelogic Threat Intelligence