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Exploited vulnerability · CISA KEV

Is CVE-2020-3952 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2020-3952, VMware vCenter Server Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 572 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 · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

VMware vCenter Server contains an information disclosure vulnerability in the VMware Directory Service (vmdir) when the Platform Services Controller (PSC) does not correctly implement access controls. Successful exploitation allows an attacker with network access to port 389 to extract sensitive information.

VendorVMware (26 exploited CVEs in KEV)
ProductvCenter Server
VulnerabilityVMware vCenter Server Information Disclosure Vulnerability
WeaknessCWE-306
Published10 Apr 2020
Added to KEV3 Nov 2021
Reported by (CNA)vmware

What to do

  1. 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.
  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 10 Apr 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for VMware.

Other exploited CVEs in vCenter Server

References

Questions

Is CVE-2020-3952 being exploited?

Yes. CISA added CVE-2020-3952 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-3952 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-2020-3952?

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 November 2021 · VMware scorecard · act-now radar.

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