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.
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Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.
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.
December 6, 2019
October 30, 2025
Affected: Red Hat Enterprise Linux 6.
https://access.redhat.com/errata/RHSA-2020:0199Affected: Red Hat Enterprise Linux 7.
https://access.redhat.com/errata/RHSA-2019:4240| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | slptool (1.2.1-11ubuntu0.16.04.2) @ xenial | 2026-06-06 | ubuntu |
| redhat | openslp-1:2.0.0-4.el6_10 | 2020-01-22 | redhat |
| redhat | openslp-1:2.0.0-8.el7_7 | 2019-12-16 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
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.
RHSA-2019:4240 — Critical
RHSA-2020:0199 — Critical
OpenSLP vulnerability
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
CVE-2020-3992 & CVE-2019-5544
Open source ↗Python / scapy module implementing SRVLOC/SLP protocol and scans for enabled OpenSLP services.
Open source ↗VMware ESXi SLP - Heap Overflow DoS
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-5544
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.
msrc · redhat
CWE-787