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CVE-2020-3992

CRITICAL

9.8

CVSS Score

Published: October 20, 2020 at 04:11 PM UTC

Updated: August 12, 2026 at 05:28 AM UTC

2 products affected across 1 vendorCloud FoundationESXi

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Severity

CRITICAL9.8

Exploitation

CISA KEV

Exploit prediction

EPSS 83%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score83.0%

EPSS (Exploit Prediction Scoring System) estimates a 83.0% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

VMware ESXi OpenSLP contains a use-after-free vulnerability that allows an attacker residing in the management network with access to port 427 to perform remote code execution.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Known

Added to KEV

Nov 3, 2021

Remediation Due

May 3, 2022

1640 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2020-3992

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cloud Foundation · VMware

95%

3.0 ≤ v < 3.10.1.24.0 ≤ v < 4.1.0.1

Affected range stops below 3.10.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.1.0.1, so it looks safe — our inference, not a vendor statement

95%

6.5 6.5 2 6.5 650-201701001 6.5 650-201703001 6.5 650-201703002 6.5 650-201704001 6.5 650-201707101 6.5 650-201707102 6.5 650-201707103 6.5 650-201707201 6.5 650-201707202 6.5 650-201707203 6.5 650-201707204 6.5 650-201707205 6.5 650-201707206 6.5 650-201707207 6.5 650-201707208 6.5 650-201707209 6.5 650-201707210 6.5 650-201707211 6.5 650-201707212 6.5 650-201707213 6.5 650-201707214 6.5 650-201707215 6.5 650-201707216 6.5 650-201707217 6.5 650-201707218 6.5 650-201707219 6.5 650-201707220 6.5 650-201707221 6.5 650-201710001 6.5 650-201712001 6.5 650-201803001 6.5 650-201806001 6.5 650-201808001 6.5 650-201810001 6.5 650-201810002 6.5 650-201811001 6.5 650-201811002 6.5 650-201811301 6.5 650-201901001 6.5 650-201903001 6.5 650-201905001 6.5 650-201908001 6.5 650-201910001 6.5 650-20191004001 6.5 650-201911001 6.5 650-201911401 6.5 650-201911402 6.5 650-201912001 6.5 650-201912002 6.5 650-201912101 6.5 650-201912102 6.5 650-201912103 6.5 650-201912104 6.5 650-201912301 6.5 650-201912401 6.5 650-201912402 6.5 650-201912403 6.5 650-201912404 6.5 650-202005001 6.5 650-202006001 6.5 650-202007001 6.5 650-202010001 6.7 6.7 670-201806001 6.7 670-201807001 6.7 670-201808001 6.7 670-201810001 6.7 670-201810101 6.7 670-201810102 6.7 670-201810103 6.7 670-201810201 6.7 670-201810202 6.7 670-201810203 6.7 670-201810204 6.7 670-201810205 6.7 670-201810206 6.7 670-201810207 6.7 670-201810208 6.7 670-201810209 6.7 670-201810210 6.7 670-201810211 6.7 670-201810212 6.7 670-201810213 6.7 670-201810214 6.7 670-201810215 6.7 670-201810216 6.7 670-201810217 6.7 670-201810218 6.7 670-201810219 6.7 670-201810220 6.7 670-201810221 6.7 670-201810222 6.7 670-201810223 6.7 670-201810224 6.7 670-201810225 6.7 670-201810226 6.7 670-201810227 6.7 670-201810228 6.7 670-201810229 6.7 670-201810230 6.7 670-201810231 6.7 670-201810232 6.7 670-201810233 6.7 670-201810234 6.7 670-201811001 6.7 670-201901001 6.7 670-201901401 6.7 670-201901402 6.7 670-201901403 6.7 670-201903001 6.7 670-201904001 6.7 670-201904201 6.7 670-201904201-ug 6.7 670-201904202 6.7 670-201904202-ug 6.7 670-201904203 6.7 670-201904203-ug 6.7 670-201904204 6.7 670-201904204-ug 6.7 670-201904205 6.7 670-201904205-ug 6.7 670-201904206 6.7 670-201904206-ug 6.7 670-201904207 6.7 670-201904207-ug 6.7 670-201904208 6.7 670-201904208-ug 6.7 670-201904209 6.7 670-201904209-ug 6.7 670-201904210 6.7 670-201904210-ug 6.7 670-201904211 6.7 670-201904211-ug 6.7 670-201904212 6.7 670-201904212-ug 6.7 670-201904213 6.7 670-201904213-ug 6.7 670-201904214 6.7 670-201904214-ug 6.7 670-201904215 6.7 670-201904215-ug 6.7 670-201904216 6.7 670-201904216-ug 6.7 670-201904217 6.7 670-201904217-ug 6.7 670-201904218 6.7 670-201904218-ug 6.7 670-201904219 6.7 670-201904219-ug 6.7 670-201904220 6.7 670-201904220-ug 6.7 670-201904221 6.7 670-201904221-ug 6.7 670-201904222 6.7 670-201904222-ug 6.7 670-201904223 6.7 670-201904223-ug 6.7 670-201904224 6.7 670-201904224-ug 6.7 670-201904225 6.7 670-201904225-ug 6.7 670-201904226 6.7 670-201904226-ug 6.7 670-201904227 6.7 670-201904227-ug 6.7 670-201904228 6.7 670-201904228-ug 6.7 670-201904229 6.7 670-201904229-ug 6.7 670-201905001 6.7 670-201906002 6.7 670-201908101 6.7 670-201908102 6.7 670-201908103 6.7 670-201908104 6.7 670-201908201 6.7 670-201908202 6.7 670-201908203 6.7 670-201908204 6.7 670-201908205 6.7 670-201908206 6.7 670-201908207 6.7 670-201908208 6.7 670-201908209 6.7 670-201908210 6.7 670-201908211 6.7 670-201908212 6.7 670-201908213 6.7 670-201908214 6.7 670-201908215 6.7 670-201908216 6.7 670-201908217 6.7 670-201908218 6.7 670-201908219 6.7 670-201908220 6.7 670-201908221 6.7 670-201912001 6.7 670-201912101 6.7 670-201912102 6.7 670-201912401 6.7 670-201912402 6.7 670-201912403 6.7 670-201912404 6.7 670-201912405 6.7 670-202004001 6.7 670-202004002 6.7 670-202004301 6.7 670-202004401 6.7 670-202004402 6.7 670-202004403 6.7 670-202004404 6.7 670-202004405 6.7 670-202004406 6.7 670-202004407 6.7 670-202004408 6.7 670-202006001 6.7 670-202008001 6.7 670-202010001 7.0.0 7.0.0 1.20.16321839 VMware ESXi (7.0 before ESXi_7.0.1-0.0.16850804, 6.7 before ESXi670-202010401-SG, 6.5 before ESXi650-202010401-SG)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.vmware.com/security/advisories/VMSA-2020-0023.html

References (4)

x_refsource_MISCPatchVendor Advisory

Source: [email protected]

https://www.vmware.com/security/advisories/VMSA-2020-0023.html

x_refsource_MISCThird Party AdvisoryVDB Entry

Source: [email protected]

https://www.zerodayinitiative.com/advisories/ZDI-20-1377/

x_refsource_MISCThird Party AdvisoryVDB Entry

Source: [email protected]

https://www.zerodayinitiative.com/advisories/ZDI-20-1385/

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3992

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-416

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