Is CVE-2019-5544 actively exploited?

Yes. CVE-2019-5544 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2019-5544 be exploited remotely?

The attack vector of CVE-2019-5544 has not been classified yet.

What is the CVSS score of CVE-2019-5544?

CVE-2019-5544 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2019-5544

HIGHCISA KEVIN THE WILD

CVE-2019-5544

Published: November 3, 2021

EPSS:92.69%probability of exploitation in 30 daysPercentile:99.7th

Official 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.

NVD Source

CISA KEV Advisory

VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2022-05-03⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This vulnerability in VMware ESXi and Horizon DaaS OpenSLP service allows remote code execution due to a heap-based buffer overflow. An attacker with network access to port 427 can exploit this flaw. Its high EPSS score of 0.92688 and inclusion in CISA's KEV highlight its critical nature and high likelihood of exploitation.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV, confirming its active use by threat actors. The ability to exploit this remotely over the network makes it a severe threat.

Recommended Action

Update VMware ESXi and Horizon DaaS to the latest patched versions to address the OpenSLP heap-based buffer overflow. If not required, consider disabling the OpenSLP service or restricting network access to port 427.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2019-5544 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2019-5544 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.