CVE•Published 2021-02-24•Modified 2026-06-02•1 article on news•6 live references•NVD data

CVE-2021-21974Vmware · Cloud_foundation

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 2% of all CVEs

Weaknesses (CWE)

CWE-787Out-of-bounds Write

Description

OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

Timeline

Published 2021-02-24

Modified 2026-06-02

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2021-21974

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Vmware Cloud Foundation"

All exposed Vmware Cloud Foundation instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Cloud Foundation"

HTTP body or banner mentions "Cloud Foundation" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-21974