CVE-2021-22050

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-16 · updated 2026-06-17
Weakness: CWE-770

Description

ESXi contains a slow HTTP POST denial-of-service vulnerability in rhttpproxy. A malicious actor with network access to ESXi may exploit this issue to create a denial-of-service condition by overwhelming rhttpproxy service with multiple requests.

Affected products

VMware Cloud Foundation: from 3.0 before 3.11; from 4.0 before 4.4 — fixed in 3.11, 4.4
VMware ESXi: 6.7-670-201806001, 6.7-670-201807001, 6.7-670-201808001, 6.7-670-201810001, 6.7-670-201810101, 6.7-670-201810102 (+155); 6.5, 6.7
VMware ESXi and VMware Cloud Foundation: VMware ESXi(7.0 U3 before ESXi70U3c-19193900, ESXi 6.7 ESXi670-202111101-SG and ESXi 6.5 before ESXi650-202110101-SG) and VMware Cloud Foundation (4.x before 4.4 and 3.x before 3.11)

How to fix

Upgrade to a fixed version: VMware Cloud Foundation 3.11, 4.4. Check the vendor advisory for mitigations.

References

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