Is CVE-2016-5311 being actively exploited?

CVE-2016-5311 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2016-5311?

CVE-2016-5311 has a CVSS 3.1 base score of 7.8 (HIGH).

CVE-2016-5311

HIGH · CVSS 7.8EPSS 0.7%EU EUVD

A Privilege Escalation vulnerability exists in Symantec Norton Antivirus, Norton AntiVirus with Backup, Norton Security, Norton Security with Backup, Norton Internet Security, Norton 360, Endpoint Protection Small Business Edition Cloud, and Endpoint Protection Cloud Client due to a DLL-preloading without path restrictions, which could let a local malicious user obtain system privileges.

Key facts

CVSS score: 7.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-427
EPSS score: 0.7% (53th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2016-6262)
Published: January 9, 2020
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2016-6262 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

symantec / endpoint protection
symantec / endpoint protection cloud
symantec / norton 360
symantec / norton antivirus
symantec / norton antivirus with backup
symantec / norton family
symantec / norton internet security
symantec / norton security
symantec / norton security with backup

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Symantec™ Endpoint Protection Version 12.1.2 - Symantec Corporation - Common Criteria 383-4-217 - archived
Symantec™ Endpoint Protection Version 11.0 - Symantec Corporation - Common Criteria 383-4-84 - archived

References

http://www.securityfocus.com/bid/94295(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1037323(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1037324(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1037325(Third Party Advisory, VDB Entry)
https://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20161117_00(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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