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CVE-2019-5544: VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2019-5544
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: VMwareproduct: ESXi and Horizon DaaSRemote code execution
What
A heap-based buffer overflow vulnerability allows an attacker with network access to perform remote code execution.
Who is affected
Users of VMware ESXi and Horizon DaaS with the vulnerable version.
Urgency
Remediation is critical due to active exploitation and high severity.
Action
Update to the latest version of VMware ESXi and Horizon DaaS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-5544

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-5544coverage & exploitation statusNVD · CVE.org

Recent advisories for VMware ESXi and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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