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Known exploited vulnerability

CVE-2021-22017

mediumCVSS 3.1 5.3In CISA KEVEPSS 49%Published · n/a

The short answer

CVE-2021-22017 affects n/a VMware vCenter Server, VMware Cloud Foundation and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-01-10: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

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.

Severity

5.3 medium

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

Exploited (CISA KEV)

Yes, since Jan 10, 2022

Federal due date Jan 24, 2022

EPSS, next 30 days

49%

Higher than 99% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

What CISA says to do

Apply updates per vendor instructions.

Affected products

VMware vCenter Server, VMware Cloud Foundation. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-22017 being exploited?

Yes. CISA added CVE-2021-22017 to its Known Exploited Vulnerabilities catalog on 2022-01-10, with a federal remediation due date of 2022-01-24.

How do I fix CVE-2021-22017?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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