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Exploited vulnerability · CISA KEV

Is CVE-2020-1040 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Microsoft Hyper-V RemoteFX · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-1040, Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 477 days after it was published. It affects Microsoft Hyper-V RemoteFX. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity9CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Microsoft Hyper-V RemoteFX vGPU contains an improper input validation vulnerability due to the host server failing to properly validate input from an authenticated user on a guest operating system. Successful exploitation allows for remote code execution on the host operating system.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductHyper-V RemoteFX
VulnerabilityMicrosoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability
WeaknessCWE-20
Published14 Jul 2020
Added to KEV3 Nov 2021
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Hyper-V RemoteFX in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft 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 14 Jul 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2020-1040 being exploited?

Yes. CISA added CVE-2020-1040 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-1040 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-2020-1040?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Hyper-V RemoteFX 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 · Microsoft scorecard · act-now radar.

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