CVE-2020-3992OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue.
Updated under an hour ago ()
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It affects vmware cloud_foundation and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.
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Free account, 1 product
OpenSLP as used in VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG) has a use-after-free issue. A malicious actor residing in the management network who has access to port 427 on an ESXi machine may be able to trigger a use-after-free in the OpenSLP service resulting in remote code execution.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 83.02% (percentile 100)
- Assigned by
- vmware
- NVD analysis
- Analyzed
- Record last updated
- Aug 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vmware cloud_foundation vmware:cloud_foundation | from 3.0 before 3.10.1.2; from 4.0 before 4.1.0.1 | NVD |
vmware esxi vmware:esxi | 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; and 193 more ranges | NVD |
References
- https://www.vmware.com/security/advisories/VMSA-2020-0023.htmlx-refsource-misc, patch, vendor-advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1377/x-refsource-misc, third-party-advisory, vdb-entry
- https://www.zerodayinitiative.com/advisories/ZDI-20-1385/x-refsource-misc, third-party-advisory, vdb-entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3992us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.