Intelligence online17 sources monitored8 actively exploited 7d26 published 24hChecked recently
Vulnerability record

CVE-2019-5544

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

CriticalExploitation confirmedCISA KEV Used by ransomware
What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run VMware ESXi and Horizon DaaS, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by May 3, 2022.

Patch status

Official fix available since

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

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.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

ProductVendorAffected versionsSource
VMware ESXi and Horizon DaaSVMware (Broadcom)—KEV
vSphere / ESXi / vCenterVMware (Broadcom)6.0; 6.5; 6.7NVD

Sources: KEV = CISA Known Exploited Vulnerabilities catalog; NVD = NIST National Vulnerability Database.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdateKEV

    CVE-2019-5544 scored CVSS 9.8: VMware VMware ESXi and Horizon DaaS, VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability

    CISA lists this as exploited in the wild and known to be used in ransomware campaigns. Unpatched VMware ESXi and Horizon DaaS systems are exposed to active attacks now.

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdateKEV

    Patch released for CVE-2019-5544: VMware VMware ESXi and Horizon DaaS, VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability

    An official fix is now available for VMware VMware ESXi and Horizon DaaS. This vulnerability is being exploited, so apply it promptly.

    Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

  • nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2019-5544
  • openwall.com http://www.openwall.com/lists/oss-security/2019/12/10/2
  • openwall.com http://www.openwall.com/lists/oss-security/2019/12/11/2
  • vmware.com http://www.vmware.com/security/advisories/VMSA-2019-0022.html
  • access.redhat.com https://access.redhat.com/errata/RHSA-2019:4240
  • access.redhat.com https://access.redhat.com/errata/RHSA-2020:0199
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMO…
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQUL…
  • security.gentoo.org https://security.gentoo.org/glsa/202005-12
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544