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Vulnerabilities

Vulnerability · CVE-2019-5544

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

Published Dec 6, 2019 · catalog updated Jun 16, 2026 · VMware VMware ESXi and Horizon DaaS

Patch now

CVE-2019-5544 is in the CISA known-exploited catalog, due May 3, 2022. Confirm VMware VMware ESXi and Horizon DaaS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
97.26%
Remediation
Remediation guidance
Affected products
cpe fedoraproject/fedora · cpe openslp/openslp · cpe redhat/enterprise linux desktop · cpe vmware/esxi · cpe vmware/horizon daas · vendor VMware VMware ESXi and Horizon DaaS

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fedoraproject/fedora30
  • cpe openslp/openslpversion unspecified
  • cpe redhat/enterprise linux desktop6.0
  • cpe vmware/esxi6.0
  • cpe vmware/horizon daasversion unspecified
  • vendor VMware VMware ESXi and Horizon DaaSversion unspecified

How to fix CVE-2019-5544

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2019-5544 is in the CISA known-exploited catalog, due May 3, 2022. Confirm VMware VMware ESXi and Horizon DaaS against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux desktop 6.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 97.26%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 6, 2019 · Catalog

    Detected

    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.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-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.gov
  • CVE.orgVulnerability recordCVE-2019-5544

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-5544

    30-day exploitation probability 97.3%

    first.org
  • NIST NVDVulnerability recordCVE-2019-5544

    OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.