What’s Vulnerable › Vulnerabilities
CVE-2019-5544: VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: yes — in CISA KEV since 2021-11-03
- EPSS: 98.1% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2019-12-06 · updated 2026-06-17
- Weakness: CWE-787
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.
Affected products
- Fedoraproject Fedora: 30, 31 (and their updates)
- Openslp: through 2.0.0
- RedHat Enterprise Linux Desktop: 6.0, 7.0 (and their updates)
- RedHat Enterprise Linux For Ibm Z Systems: 6.0_s390x, 7.0_s390x (and their updates)
- RedHat Enterprise Linux For Ibm Z Systems Eus: 7.7_s390x (and their updates)
- RedHat Enterprise Linux For Power Big Endian: 6.0_ppc64, 7.0_ppc64 (and their updates)
- RedHat Enterprise Linux For Power Big Endian Eus: 7.7_ppc64 (and their updates)
- RedHat Enterprise Linux For Power Little Endian: 7.0_ppc64le (and their updates)
- RedHat Enterprise Linux For Power Little Endian Eus: 7.7_ppc64le (and their updates)
- RedHat Enterprise Linux Server: 6.0, 7.0 (and their updates)
- RedHat Enterprise Linux Server Aus: 7.7 (and their updates)
- RedHat Enterprise Linux Server Eus: 7.7 (and their updates)
- RedHat Enterprise Linux Server Tus: 7.7 (and their updates)
- RedHat Enterprise Linux Workstation: 6.0, 7.0 (and their updates)
- VMware ESXi: 6.0-1, 6.0-1a, 6.0-1b, 6.0-2, 6.0-3, 6.0-3a (+230); 6.0, 6.5, 6.7
- VMware Horizon DaaS: from 8.0.0 before 9.0.0.0 — fixed in 9.0.0.0
- ESXi and Horizon DaaS: from ESXi 6.7 prior through patch release ESXi670-201912001, ESXi 6.5 prior to patch release ESXi650-201912001, ESXi 6.0 prior to patch release ESXi600-201912001 and Horizon DaaS 8.x prior to BZ-2467224-Disable_SLPD_service_permanently_801_Hotfix.
How to fix
Upgrade to a fixed version: VMware Horizon DaaS 9.0.0.0. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2019/12/10/2
- http://www.openwall.com/lists/oss-security/2019/12/11/2
- http://www.vmware.com/security/advisories/VMSA-2019-0022.html
- https://access.redhat.com/errata/RHSA-2019:4240
- https://access.redhat.com/errata/RHSA-2020:0199
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/
- https://security.gentoo.org/glsa/202005-12
- http://www.openwall.com/lists/oss-security/2019/12/10/2
- http://www.openwall.com/lists/oss-security/2019/12/11/2
- http://www.vmware.com/security/advisories/VMSA-2019-0022.html
- https://access.redhat.com/errata/RHSA-2019:4240
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