VMware · VMware ESXi and Horizon DaaS
CVE-2019-5544
VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability
What it is
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.
CISA: VMware ESXi and Horizon Desktop as a Service (DaaS) OpenSLP contains a heap-based buffer overflow vulnerability that allows an attacker with network access to port 427 to overwrite the heap of the OpenSLP service to perform remote code execution.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
- Added to the CISA list
- November 3, 2021
- Published
- December 6, 2019
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 98% in the top 0.1% of all known vulnerabilities
- Weakness
- CWE-787
- More details
- NVD · CVE.org · CISA
All references (8)
- https://access.redhat.com/errata/RHSA-2019:4240
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQU…
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKM…
- https://access.redhat.com/errata/RHSA-2020:0199
- https://security.gentoo.org/glsa/202005-12
- http://www.vmware.com/security/advisories/VMSA-2019-0022.html
- http://www.openwall.com/lists/oss-security/2019/12/10/2
- http://www.openwall.com/lists/oss-security/2019/12/11/2
More exploited flaws from VMware
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 4, 2025 | TOCTOU Race Condition | ESXi and Workstation | Critical 9.3 | 1.6% |
| Mar 4, 2025 | Arbitrary Write | ESXi | High 8.2 | 1.0% |
| Mar 4, 2025 | Information Disclosure | ESXi, Workstation, and Fusion | High 7.1 | 1.6% |
| Nov 20, 2024 | Heap-Based Buffer Overflow | vCenter Server | Critical 9.8 | 55% |
| Nov 20, 2024 | Privilege Escalation | vCenter Server | High 7.5 | 17% |
| Jul 30, 2024 | Authentication Bypass | ESXi | Medium 6.8 | 27% |
| Jul 17, 2024 | Incorrect Default File Permissions Vulnerability | vCenter Server | Medium 6.5 | 13% |
| Jan 22, 2024 | Out-of-Bounds Write | vCenter Server | Critical 9.8 | 99.2% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.