CVEs / CVE-2016-0099

CVE-2016-0099: Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability

• Known exploited in the CISA KEV catalog since 3 Mar 2022
• high 7.8 CVSS 3.1 (NVD)
• EPSS 37% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
• Last changed at its sources 17 Jun 2026

Summary

A privilege escalation vulnerability exists in Microsoft Windows if the Windows Secondary Logon Service fails to properly manage request handles in memory. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator.

Description

The Secondary Logon Service in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 does not properly process request handles, which allows local users to gain privileges via a crafted application, aka "Secondary Logon Elevation of Privilege Vulnerability."

Affected and fixed versions

Exploitation

Severity

References

• CVE-2016-0099 on NVD
• CVE-2016-0099 in the CISA KEV catalog
• http://www.securityfocus.com/bid/84034 Broken Link, Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1035210 Broken Link, Third Party Advisory, VDB Entry
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-032 Patch, Vendor Advisory
• https://www.exploit-db.com/exploits/39574/ Exploit, Third Party Advisory, VDB Entry
• https://www.exploit-db.com/exploits/39719/ Exploit, Third Party Advisory, VDB Entry
• https://www.exploit-db.com/exploits/39809/ Exploit, Third Party Advisory, VDB Entry
• https://www.exploit-db.com/exploits/40107/ Exploit, Third Party Advisory, VDB Entry
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-0099 US Government Resource