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CVE-2021-22017: VMware vCenter Server Improper Access Control

criticalknown exploitedpublic exploitCVE-2021-22017
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.

CSIRTS triage

vendor: VMwareproduct: vCenter ServerAuthentication bypassOther
What
Rhttproxy in vCenter Server has a vulnerability due to improper URI normalization.
Who is affected
Deployments of vCenter Server that utilize Rhttproxy.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patch provided by VMware.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-01-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-22017

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-22017coverage & exploitation statusNVD · CVE.org

Recent advisories for VMware vCenter Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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