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Exploited vulnerability · CISA KEV

Is CVE-2021-21973 exploited? Yes: in CISA KEV since 7 Mar 2022

Gociux · VMware vCenter Server and Cloud Foundation · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-21973, VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Mar 2022, 376 days after it was published. It affects VMware vCenter Server and Cloud Foundation. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 7 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity5.3CVSS 3.1 · medium
US federal due21 Mar 2022BOD 22-01 deadline

What it is

VMware vCenter Server and Cloud Foundation Server contain a SSRF vulnerability due to improper validation of URLs in a vCenter Server plugin. This allows for information disclosure.

VendorVMware (26 exploited CVEs in KEV)
ProductvCenter Server and Cloud Foundation
VulnerabilityVMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability
WeaknessCWE-20, CWE-918
Published24 Feb 2021
Added to KEV7 Mar 2022
Reported by (CNA)vmware

What to do

  1. Check whether you run it. Look for vCenter Server and Cloud Foundation in your asset inventory, including appliances and cloud images. Stack check lists every exploited VMware CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. 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 24 Feb 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for VMware.

References

Questions

Is CVE-2021-21973 being exploited?

Yes. CISA added CVE-2021-21973 to the Known Exploited Vulnerabilities catalog on 7 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-21973 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-2021-21973?

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 Cloud Foundation 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 March 2022 · VMware scorecard · act-now radar.

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