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PatchSiren cyber security CVE debrief

CVE-2020-0646 Microsoft CVE debrief

CVE-2020-0646 is a Microsoft .NET Framework remote code execution vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it is flagged by CISA as known exploited, defenders should treat it as a patching priority and apply vendor-recommended updates as soon as possible.

Vendor
Microsoft
Product
.NET Framework
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Windows administrators, endpoint and server owners, application teams that rely on Microsoft .NET Framework, and vulnerability management or security operations teams responsible for patch prioritization.

Technical summary

The supplied source corpus identifies CVE-2020-0646 as a Microsoft .NET Framework remote code execution vulnerability. The corpus does not include affected version details, exploit conditions, or technical root cause, but the CISA KEV listing indicates it is important to remediate promptly. Use the official CVE and NVD records, along with vendor guidance, to confirm exposure and apply the appropriate update.

Defensive priority

Urgent

Recommended defensive actions

  • Apply Microsoft updates for the affected .NET Framework installation(s) per vendor instructions.
  • Inventory systems that use Microsoft .NET Framework and confirm whether they are exposed to this CVE.
  • Prioritize remediation on internet-facing, high-value, and hard-to-patch systems.
  • Track remediation using the official CVE record and NVD detail page to verify status.
  • If immediate patching is not possible, document compensating controls and schedule emergency remediation.

Evidence notes

This debrief is based only on the supplied source corpus: the CISA Known Exploited Vulnerabilities entry, the official CVE record, and the NVD detail page referenced by the corpus. The corpus provides the vulnerability name, product, KEV inclusion date, and required action, but does not provide CVSS, affected versions, exploit mechanics, or Microsoft advisory text. The CVE published and modified dates supplied in the corpus are 2021-11-03, and the CISA KEV date added is 2021-11-03.

Sources and references

Verified primary and authoritative sources

  • CVE-2020-0646 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2020-0646

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2020-0646 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2020-0646

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.