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

> CVE-2019-5544: VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2019-5544
Last updated: 2025-10-21T23:35:56Z

- Published: 2019-12-06 15:54 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: vmware
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 98.1%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- n/a: ESXi and Horizon DaaS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-5544)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2019-5544)
- [https://access.redhat.com/errata/RHSA-2019:4240](https://access.redhat.com/errata/RHSA-2019:4240)
- [https://access.redhat.com/errata/RHSA-2020:0199](https://access.redhat.com/errata/RHSA-2020:0199)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/)
- [https://security.gentoo.org/glsa/202005-12](https://security.gentoo.org/glsa/202005-12)
- [http://www.openwall.com/lists/oss-security/2019/12/10/2](http://www.openwall.com/lists/oss-security/2019/12/10/2)
- [http://www.openwall.com/lists/oss-security/2019/12/11/2](http://www.openwall.com/lists/oss-security/2019/12/11/2)
- [http://www.vmware.com/security/advisories/VMSA-2019-0022.html](http://www.vmware.com/security/advisories/VMSA-2019-0022.html)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2019-5544 · Markdown: https://rewindex.com/cve/CVE-2019-5544.md · JSON: https://rewindex.com/api/v1/cves/CVE-2019-5544 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:26.329Z