CVE-2019-1215: in the CISA KEV catalogue
Microsoft Windows Privilege Escalation Vulnerability. CISA added CVE-2019-1215 to the Known Exploited Vulnerabilities catalogue on 2021-11-03 with a default due date of 2022-05-03. Known ransomware campaign use: Known. Forensic triage flag: No.
Microsoft Windows contains an unspecified vulnerability due to the way ws2ifsl.sys (Winsock) handles objects in memory, allowing for privilege escalation. Successful exploitation allows an attacker to execute code with elevated privileges. (CISA description)
- Vendor / product
- Microsoft Windows
- CWE
- Not listed
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 19%, percentile 97 (scored 2026-11-03)
EPSS puts about 19 in 100 odds (19%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 97% 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-2019-1215 in the CISA KEV catalogue?
Yes. CISA added CVE-2019-1215 (Microsoft Windows Privilege Escalation Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2021-11-03. CISA's default due date for it is 2022-05-03.
Is CVE-2019-1215 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2019-1215.
What should I do about CVE-2019-1215?
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-2019-1215