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CVE-2020-5396

28
FAUCET Score

CVE-2020-5396 describes an insecure default configuration in the JMX service of VMware GemFire and Tanzu GemFire for VMs, specifically when deployed without a SecurityManager. This vulnerability allows an authenticated attacker to achieve remote code execution by creating an MLet mbean. With a CVSS score of 8.8 (High), it presents a significant risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 9.7.0, < 9.7.6CPE matchmatch criteria
cpe:2.3:a:vmware:gemfire:*:*:*:*:*:*:*:*
>= 9.8.0, < 9.8.7CPE matchmatch criteria
cpe:2.3:a:vmware:gemfire:*:*:*:*:*:*:*:*
>= 9.9.0, < 9.9.2CPE matchmatch criteria
cpe:2.3:a:vmware:gemfire:*:*:*:*:*:*:*:*
>= 1.10.0, < 1.10.2CPE matchmatch criteria
cpe:2.3:a:vmware:tanzu_gemfire_for_virtual_machines:*:*:*:*:*:*:*:*
>= 1.11.0, < 1.11.1CPE matchmatch criteria
cpe:2.3:a:vmware:tanzu_gemfire_for_virtual_machines:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.89%
Probability of exploitation in next 30 days
EPSS Percentile
77.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0189 is in the 76th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

tanzu.vmware.com / security/cve-2020-5396
Vendor Advisory