Home→Vulnerabilities→CVE-2020-3992
Critical Risk Active Exploitation

CVE-2020-3992

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.

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Confirmed Active Exploitation

This vulnerability is listed in the CISA KEV Catalog. Federal agencies are mandated to patch immediately. Immediate remediation is required.

Exploitation Probability (EPSS)

Critical Priority
82.69%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

4 events
Oct 20, 2020
Vulnerability Disclosed
Published to component-level vulnerability database.
Oct 30, 2025
Last Updated
Record updated with new analysis or tags.
Nov 19, 2025
EPSS Score Decreased
Daily EPSS score decreased by 0.196 on 2023-12-30
Nov 22, 2025
EPSS Score Increased
Daily EPSS score increased by 0.196 on 2023-12-30

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

3 Total
vmware/cloud_foundationAll Versions
vmware/esxi6.5
vmware/esxi6.7

References

https://www.vmware.com/security/advisories/VMSA-2020-0023.htmlVmware
PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-1377/Zerodayinitiative
Third Party AdvisoryVDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-20-1385/Zerodayinitiative
Third Party AdvisoryVDB Entry
https://www.vmware.com/security/advisories/VMSA-2020-0023.htmlVmware
PatchVendor Advisory

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Vulnerability Details

CVSS Base Score
9.8/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published Date
Oct 20, 2020
Last Modified
Oct 30, 2025
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