November 3, 2021 · Applied Cybernetics Group
CVE-2019-5544 — VMware VMware ESXi and Horizon DaaS
known ransomware use
VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- VMware
- Product
- VMware ESXi and Horizon DaaS
- EPSS
- 99.7th percentile (score 0.921, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2019-5544
CISA short description
VMware ESXi and Horizon Desktop as a Service (DaaS) OpenSLP contains a heap-based buffer overflow vulnerability that allows an attacker with network access to port 427 to overwrite the heap of the OpenSLP service to perform remote code execution.
Required action
Apply updates per vendor instructions.