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CVE-2019-5544

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

VMware · CWE-787 — Out-of-bounds write · in CISA KEV since 2021-11-03

ExigentKEV since 2021 · listed over a yearRansomwareCISA KEVActively Exploited
93

EVRS 93 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 84 of 2,960 tracked

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Why it scores 93

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and associated with known ransomware campaigns.

  • CISA KEVApplied
  • RansomwareApplied
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

openslp-dfsg -> 1.2.1-11ubuntu0.16.04.2 | openslp-dfsg -> 1.2.1-9ubuntu0.3+esm1

Affected versions

  • horizon daas>= 8.0.0 < 9.0.0.0
  • openslp<= 2.0.0
  • esxi6.06.56.7
  • enterprise linux desktop6.07.0
  • enterprise linux for ibm z systems6.0 s390x7.0 s390x
  • enterprise linux for ibm z systems eus7.7 s390x
  • enterprise linux for power big endian6.0 ppc647.0 ppc64
  • enterprise linux for power big endian eus7.7 ppc64

+8 more affected products; see the full list at NVD.

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.981 (99.91st pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Known CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-05-03 · KEV since 2021 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by vmware. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do