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CVE-2020-3963

21
FAUCET Score

CVE-2020-3963 is a use-after-free vulnerability in PVNVRAM affecting VMware ESXi, Workstation, and Fusion. A local attacker with access to a virtual machine could exploit this to read privileged information from physical memory. Rated Medium (CVSS 5.5), it requires local access and has a high confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion, though it did receive limited media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0, < 3.10CPE matchmatch criteria
cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.1CPE matchmatch criteria
cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*
>= 11.0.0, < 11.5.2CPE matchmatch criteria
cpe:2.3:a:vmware:fusion:*:*:*:*:*:*:*:*
>= 15.0.0, < 15.5.2CPE matchmatch criteria
cpe:2.3:a:vmware:workstation:*:*:*:*:*:*:*:*
6.5CPE matchmatch criteria
cpe:2.3:o:vmware:esxi:6.5:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 93rd percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

vmwarevendor investigatingvia nvd_reference
View patch

References

packetstormsecurity.com / files/158459/VMware-ESXi-Use-After-Free-Out-Of-Bounds-Access.html
ExploitThird Party AdvisoryVDB Entry
seclists.org / fulldisclosure/2020/Jul/22
ExploitMailing ListThird Party Advisory
vmware.com / security/advisories/VMSA-2020-0015.html
Vendor Advisory