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PatchSiren cyber security CVE debrief

CVE-2017-0261 Microsoft CVE debrief

CVE-2017-0261 is a Microsoft Office use-after-free vulnerability that CISA has listed in its Known Exploited Vulnerabilities catalog. That means defenders should treat it as a real-world threat, not just a theoretical flaw. The supplied source corpus only confirms the vulnerability name, vendor/product, and that remediation should follow vendor update guidance.

Vendor
Microsoft
Product
Office
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-03
Original CVE updated
2022-03-03
Advisory published
2022-03-03
Advisory updated
2022-03-03

Who should care

Organizations that use Microsoft Office, especially endpoint, IT, and vulnerability management teams responsible for patching Windows desktops and user workstations. Security teams should prioritize this issue because CISA has identified it as known exploited.

Technical summary

The source corpus identifies the issue as a use-after-free vulnerability in Microsoft Office. No CVSS score, affected version range, or exploit details are supplied here. Because it appears in CISA’s Known Exploited Vulnerabilities catalog, the practical takeaway is to prioritize patching through Microsoft’s vendor guidance rather than treating it as a routine informational advisory.

Defensive priority

High. CISA KEV inclusion indicates active or historical exploitation, and the supplied KEV record sets a remediation due date of 2022-03-24. Systems with Microsoft Office should be reviewed and updated as soon as possible using vendor instructions.

Recommended defensive actions

  • Apply Microsoft updates per vendor instructions.
  • Check endpoint inventory for systems with Microsoft Office installed.
  • Prioritize remediation before or by the KEV due date when possible.
  • Validate that patch deployment succeeded across user workstations and remote devices.
  • Monitor vendor and CISA guidance for any additional remediation notes.

Evidence notes

All core claims are limited to the supplied corpus: the CVE title/description, the CISA KEV entry, and the official links provided. The source item metadata states 'Apply updates per vendor instructions.' and records dateAdded as 2022-03-03 with dueDate as 2022-03-24. No exploit chain, affected versions, or impact details beyond 'use-after-free' are asserted.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-0261 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-0261

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

  • CVE-2017-0261 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-0261

    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.