Is CVE-2019-5544 in the CISA KEV catalog?

Yes. CVE-2019-5544 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03, and has known ransomware campaign use.

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

CVE-2019-5544 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2019-5544?

CVE-2019-5544 has an EPSS score of 96.82% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-5544?

Upgrade libslp1 on ubuntu 14.04 to 1.2.1-9ubuntu0.3+esm1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-5544

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libslp1Ubuntu

Fixed in:1.2.1-9ubuntu0.3+esm1USN-4919-1

Fixed in:1.2.1-11ubuntu0.16.04.2USN-4919-1

openslp-dfsgUbuntu

Fixed in:1.2.1-9ubuntu0.3+esm1USN-4919-1

Fixed in:1.2.1-11ubuntu0.16.04.2USN-4919-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

96.82%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

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

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.

Apply updates per vendor instructions.

Remediation due: 2022-05-03

Associated with ransomware campaigns

References

Patch1

vmware.com

Third-Party Advisory5

Government Resource1

cisa.gov

Release Notes2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

Embed a live status badge for CVE-2019-5544

Markdown

[![CVE-2019-5544](https://tridentstack.com/cve/badge/CVE-2019-5544.svg)](https://tridentstack.com/cve/CVE-2019-5544)

HTML

<a href="https://tridentstack.com/cve/CVE-2019-5544"><img src="https://tridentstack.com/cve/badge/CVE-2019-5544.svg" alt="CVE-2019-5544"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-30.