Exploited vulnerability · CISA KEV
Is CVE-2021-22017 exploited? Yes: in CISA KEV since 10 Jan 2022
Gociux · VMware vCenter Server · data: CISA KEV, CVE record, FIRST EPSS
Yes. CVE-2021-22017, VMware vCenter Server Improper Access Control, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 10 Jan 2022, 109 days after it was published. It affects VMware vCenter Server. If you run it, CISA's required action is: Apply updates per vendor instructions.
exploitedYesCISA KEV · 10 Jan 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity5.3CVSS 3.1 · medium
US federal due24 Jan 2022BOD 22-01 deadline
What it is
Rhttproxy as used in vCenter Server contains a vulnerability due to improper implementation of URI normalization.
| Vendor | VMware (26 exploited CVEs in KEV) |
| Product | vCenter Server |
| Vulnerability | VMware vCenter Server Improper Access Control |
| Weakness | CWE-23 |
| Published | 23 Sep 2021 |
| Added to KEV | 10 Jan 2022 |
| Reported by (CNA) | vmware |
What to do
- Check whether you run it. Look for vCenter Server in your asset inventory, including appliances and cloud images. Stack check lists every exploited VMware CVE at once.
- Apply the fix. Apply updates per vendor instructions.
- If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 Sep 2021.
- Get told next time. Email alerts when CISA adds a CVE for VMware.
Other exploited CVEs in vCenter Server
- CVE-2024-38813: VMware vCenter Server Privilege Escalation Vulnerability (20 Nov 2024)
- CVE-2024-38812: VMware vCenter Server Heap-Based Buffer Overflow Vulnerability (20 Nov 2024)
- CVE-2022-22948: VMware vCenter Server Incorrect Default File Permissions Vulnerability (17 Jul 2024)
- CVE-2023-34048: VMware vCenter Server Out-of-Bounds Write Vulnerability (22 Jan 2024)
- CVE-2021-22005: VMware vCenter Server File Upload Vulnerability (3 Nov 2021)
- CVE-2020-3952: VMware vCenter Server Information Disclosure Vulnerability (3 Nov 2021)
References
Questions
Is CVE-2021-22017 being exploited?
Yes. CISA added CVE-2021-22017 to the Known Exploited Vulnerabilities catalog on 10 Jan 2022, which means there is reliable evidence of exploitation in the wild.
Is CVE-2021-22017 used in ransomware attacks?
CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.
How do I fix CVE-2021-22017?
Apply updates per vendor instructions. Check VMware's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected vCenter Server and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2022 · VMware scorecard · act-now radar.
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