Security readout for executives and security teams
CVE-2019-5544 is a critical heap overwrite flaw in OpenSLP as used by VMware ESXi and Horizon DaaS appliances. It is high urgency because it is network-reachable, needs no authentication or user interaction, and CISA lists it as known exploited. Exposure is most likely in legacy VMware ESXi 6.0, 6.5, 6.7 hosts and Horizon DaaS 8.x appliances that still run vulnerable OpenSLP or lack the cited VMware fixes. Linux OpenSLP packages may also require vendor review based on Red Hat, Fedora, and Gentoo advisories. Prioritize remediation immediately for any exposed VMware virtualization infrastructure. This is a critical, known-exploited vulnerability affecting systems that often host core business workloads, so delayed remediation can create broad operational and data risk. Mitigation focus: Apply VMware ESXi patch releases ESXi670-201912001, ESXi650-201912001, or ESXi600-201912001 as applicable.; Apply the Horizon DaaS 8.x hotfix BZ-2467224-Disable_SLPD_service_permanently_801_Hotfix where applicable.; Review VMware guidance for supported workarounds if immediate patching is not possible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2019-5544 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2019:4240CVE reference · vendor-advisory, x_refsource_REDHAT
- FEDORA-2019-1e5ae33e87CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2019-86bceb61b3CVE reference · vendor-advisory, x_refsource_FEDORA
- RHSA-2020:0199CVE reference · vendor-advisory, x_refsource_REDHAT
- GLSA-202005-12CVE reference · vendor-advisory, x_refsource_GENTOO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.