How severe is CVE-2020-3995?

CVE-2020-3995 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-3995 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-3995?

CVE-2020-3995 primarily affects Vmware Esxi. In total, 174 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-3995?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-3995 published?

CVE-2020-3995 was published on 2020-10-20 and last updated on 2026-06-17.

CVE-2020-3995

CVE-2020-3995 is a medium-severity vulnerability in Vmware Esxi with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-401.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 3.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-401
Affected product: Vmware Esxi
Published: 2020-10-20
Last modified: 2026-06-17

Description

In VMware ESXi (6.7 before ESXi670-201908101-SG, 6.5 before ESXi650-202007101-SG), Workstation (15.x before 15.1.0), Fusion (11.x before 11.1.0), the VMCI host drivers used by VMware hypervisors contain a memory leak vulnerability. A malicious actor with access to a virtual machine may be able to trigger a memory leak issue resulting in memory resource exhaustion on the hypervisor if the attack is sustained for extended periods of time.

Frequently asked questions

What is CVE-2020-3995?: In VMware ESXi (6.7 before ESXi670-201908101-SG, 6.5 before ESXi650-202007101-SG), Workstation (15.x before 15.1.0), Fusion (11.x before 11.1.0), the VMCI host drivers used by VMware hypervisors contain a memory leak vulnerability. A malicious actor with access to a virtual machine may be able to trigger a memory leak issue resulting in memory resource exhaustion on the hypervisor if the attack is sustained for extended periods of time.
How severe is CVE-2020-3995?: CVE-2020-3995 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-3995 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3995?: CVE-2020-3995 primarily affects Vmware Esxi. In total, 174 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-3995?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-3995 published?: CVE-2020-3995 was published on 2020-10-20 and last updated on 2026-06-17.

References

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

Affected products (174)

cpe:2.3:o:vmware:esxi:6.7:-:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201806001:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201807001:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201808001:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810001:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810101:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810102:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810103:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810201:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810202:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810203:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810204:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810205:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810206:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810207:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810208:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810209:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810210:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810211:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810212:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810213:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810214:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810215:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810216:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810217:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810218:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810219:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810220:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810221:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810222:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810223:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810224:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810225:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810226:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810227:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810228:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810229:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810230:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810231:*:*:*:*:*:*
cpe:2.3:o:vmware:esxi:6.7:670-201810232:*:*:*:*:*:*

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