CVE-2019-5544

ESXi and Horizon DaaS

Published 6 Dec 2019 · updated 17 Jun 2026 · Analyzed

9.8 Critical · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 3 May 2022 for US federal agencies. It has been used in ransomware campaigns.

Required action: Apply updates per vendor instructions.

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.

References

www.openwall.com/lists/oss-security/2019/12/10/2 · Mailing List, Third Party Advisory
www.openwall.com/lists/oss-security/2019/12/11/2 · Mailing List, Third Party Advisory
www.vmware.com/security/advisories/VMSA-2019-0022.html · Patch, Vendor Advisory
access.redhat.com/errata/RHSA-2019:4240 · Third Party Advisory
access.redhat.com/errata/RHSA-2020:0199 · Third Party Advisory
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/ · Release Notes
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/ · Release Notes
security.gentoo.org/glsa/202005-12 · Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544 · US Government Resource