CVE-2019-5544
VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 3 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 98.13% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 3 November 2021 · due 3 May 2022 · used in ransomware campaigns
- Weakness
- CWE-787
- Affected
- vmware/horizon daas · vmware/esxi · redhat/enterprise linux desktop · redhat/enterprise linux for ibm z systems · redhat/enterprise linux for ibm z systems eus · redhat/enterprise linux for power big endian · redhat/enterprise linux for power big endian eus · redhat/enterprise linux for power little endian · redhat/enterprise linux for power little endian eus · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus · redhat/enterprise linux workstation · openslp/openslp · fedoraproject/fedora
- Source
- security@vmware.com
EPSS 98.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-5544
References
- http://www.openwall.com/lists/oss-security/2019/12/10/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/12/11/2Mailing List, Third Party Advisory
- http://www.vmware.com/security/advisories/VMSA-2019-0022.htmlPatch, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2019:4240Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0199Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/Release Notes
- https://security.gentoo.org/glsa/202005-12Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/12/10/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/12/11/2Mailing List, Third Party Advisory
- http://www.vmware.com/security/advisories/VMSA-2019-0022.htmlPatch, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2019:4240Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0199Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA3LYAJ2NRKMOZLZOQNDJ5TNQRFMWGHF/Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZPXXJZLPLAQULBCJVI5NNWZ3PGWXGXWG/Release Notes
- https://security.gentoo.org/glsa/202005-12Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-5544US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.