CVE-2016-0099: in the CISA KEV catalogue
Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability. CISA added CVE-2016-0099 to the Known Exploited Vulnerabilities catalogue on 2022-03-03 with a default due date of 2022-03-24. Known ransomware campaign use: Known. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- Microsoft Windows
- CWE
- CWE-264
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 37%, percentile 98 (scored 2026-11-03)
EPSS puts about 37 in 100 odds (37%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 98% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2016-0099 in the CISA KEV catalogue?
Yes. CISA added CVE-2016-0099 (Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-03-03. CISA's default due date for it is 2022-03-24.
Is CVE-2016-0099 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2016-0099.
What should I do about CVE-2016-0099?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2016-0099