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Exploited vulnerability · CISA KEV

Is CVE-2020-1147 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Microsoft .NET Framework, SharePoint, Visual Studio · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-1147, Microsoft .NET Framework, SharePoint, and Visual Studio 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 .NET Framework, SharePoint, Visual Studio. 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
severity7.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.

VendorMicrosoft (391 exploited CVEs in KEV)
Product.NET Framework, SharePoint, Visual Studio
VulnerabilityMicrosoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability
Weaknessnot specified
Published14 Jul 2020
Added to KEV3 Nov 2021
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for .NET Framework, SharePoint, Visual Studio 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-2020-1147 being exploited?

Yes. CISA added CVE-2020-1147 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-1147 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-2020-1147?

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 .NET Framework, SharePoint, Visual Studio 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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