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CVE-2021-22017

87
FAUCET Score

CVE-2021-22017 is a medium-severity vulnerability in VMware vCenter Server's Rhttproxy, stemming from improper URI normalization. This flaw allows an unauthenticated attacker with network access to port 443 to bypass proxy controls and access internal endpoints. With a CVSS score of 5.3, it presents a low attack complexity and no user interaction, potentially leading to information disclosure. This vulnerability is actively exploited in the wild, listed in CISA's KEV catalog, and has garnered significant community discussion and media coverage, despite a lack of public Metasploit or ExploitDB modules.

Impacted Technologies

VendorProductVersion(s)CPE
6.7CPE matchmatch criteria
cpe:2.3:a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
49.18%
Probability of exploitation in next 30 days
EPSS Percentile
98.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Added to KEV · Jan 10, 2022
Nuclei: CVE-2021-22017 · Jan 14, 2026
This CVE's current EPSS score of 0.4918 is in the 99th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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

Remediation

Patch Available

Vendor Patches (1)

vmwarepatch availablevia nvd_reference
View patch

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
vmware.com / security/advisories/VMSA-2021-0020.html
PatchVendor Advisory