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ExploitedIn CISA KEVFix available

CVE-2021-22017

Exploitation confirmed. First attested on 2022-01-10 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2021-09-23

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-09-2313:15CVE publishedNVD
  2. 2022-01-10Added to the CISA KEV catalogCISA KEV
  3. 2022-01-10Listed as exploited by GCVEGCVE
  4. 2022-01-10Exploitation first reportedCISA KEV
  5. 2025-01-2917:54SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-22017?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22017?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Vmware vcenter server
BranchAffectedFixed in
6.7= 6.7no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As vmware, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • VMware vCenter Server, VMware Cloud Foundation
    Affected
    • = VMware vCenter Server(6.7 before 6.7 U3o and 6.5 before 6.5 U3q) and VMware Cloud Foundation 3.x before 3.10.2.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-09-23

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-01-24

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-01-10
Patch Due Date
2022-01-24
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2021-09-23
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-w46j-w72r-9x98

Frequently asked questions

What is CVE-2021-22017?

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.

Is CVE-2021-22017 actively exploited?

Yes. CVE-2021-22017 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-01-24.

What is the CVSS score for CVE-2021-22017?

CVE-2021-22017 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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Sources for this record