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Exploited vulnerability · CISA KEV

Is CVE-2023-34048 exploited? Yes: in CISA KEV since 22 Jan 2024

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

Yes. CVE-2023-34048, VMware vCenter Server Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 22 Jan 2024, 89 days after it was published. It affects VMware vCenter Server. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 22 Jan 2024
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due12 Feb 2024BOD 22-01 deadline

What it is

VMware vCenter Server contains an out-of-bounds write vulnerability in the implementation of the DCERPC protocol that allows an attacker to conduct remote code execution.

VendorVMware (26 exploited CVEs in KEV)
ProductvCenter Server
VulnerabilityVMware vCenter Server Out-of-Bounds Write Vulnerability
WeaknessCWE-787
Published25 Oct 2023
Added to KEV22 Jan 2024
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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 25 Oct 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for VMware.

Other exploited CVEs in vCenter Server

References

Questions

Is CVE-2023-34048 being exploited?

Yes. CISA added CVE-2023-34048 to the Known Exploited Vulnerabilities catalog on 22 Jan 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-34048 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-2023-34048?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. 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 2024 · VMware scorecard · act-now radar.

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