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CVE-2021-22017

MEDIUM
5.3
CVSS Score
Published: September 23, 2021 at 12:13 PM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 1 vendorvCenter ServerCloud Foundation

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Severity
MEDIUM5.3
Exploitation
CISA KEV
Exploit prediction
EPSS 49%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score49.2%

EPSS (Exploit Prediction Scoring System) estimates a 49.2% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Jan 10, 2022
Remediation Due
Jan 24, 2022
1737 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-22017

Description

Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to bypass proxy leading to internal endpoints being accessed.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

vCenter Server· VMware
95%
v < 6.76.7
Affected range stops below 6.7, so it looks safe — our inference, not a vendor statement
Cloud Foundation· VMware
60%
v < 6.7
Affected range stops below 6.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://www.vmware.com/security/advisories/VMSA-2021-0020.html
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22017

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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