VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability (CVE-2019-5544)
Severity: critical · Patch status: patched · Since 2021-11-03 · CVE-2019-5544
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. CISA added CVE-2019-5544 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by May 3, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
