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

CVE-2019-5544 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 96.8%.

Is there a public PoC exploit available for CVE-2019-5544?

Yes, a public proof-of-concept exploit is available for CVE-2019-5544. Prioritise patching immediately. EPSS: 96.8%.

Is there a patch available for CVE-2019-5544?

Yes, a patch is available for CVE-2019-5544. Update the affected software to the latest version immediately.

Horizon Daas CVE-2019-5544

CRITICAL

Out-of-bounds Write (CWE-787)

2019-12-06 security@vmware.com

Buffer Overflow VMware Memory Corruption Horizon Daas ESXi Enterprise Linux Desktop Enterprise Linux For Ibm Z Systems Enterprise Linux For Ibm Z Systems Eus Enterprise Linux For Power Big Endian Enterprise Linux For Power Big Endian Eus Enterprise Linux For Power Little Endian Enterprise Linux For Power Little Endian Eus Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Server Eus Enterprise Linux Server Tus Enterprise Linux Workstation Openslp Fedora

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Dec 06, 2019 - 16:15 nvd

CRITICAL 9.8

DescriptionNVD

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.

AnalysisAI

OpenSLP as used in ESXi and the Horizon DaaS appliances has a heap overwrite issue. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Out-of-bounds Write vulnerability could allow attackers to write data beyond allocated buffer boundaries leading to code execution or crashes.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. 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. Affected products include: Vmware Horizon Daas, Vmware Esxi, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux For Ibm Z Systems, Redhat Enterprise Linux For Ibm Z Systems Eus.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).