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PatchSiren cyber security CVE debrief

CVE-2009-0557 Microsoft CVE debrief

CVE-2009-0557 is a Microsoft Office object record corruption vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. That KEV listing means CISA has determined the issue is known to be exploited in the wild and recommends applying vendor updates per Microsoft’s guidance. The supplied records do not include affected versions, impact details, or attack mechanics, so the safest response is broad verification and prompt remediation across all Microsoft Office deployments.

Vendor
Microsoft
Product
Office
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-06-08
Original CVE updated
2022-06-08
Advisory published
2022-06-08
Advisory updated
2022-06-08

Who should care

Security operations teams, endpoint administrators, and IT asset owners responsible for Microsoft Office installations should treat this as a high-priority patching item. Organizations with incomplete software inventory, delayed patch cycles, or legacy Office deployments should pay particular attention.

Technical summary

The supplied source corpus identifies CVE-2009-0557 as a Microsoft Office 'Object Record Corruption Vulnerability' and shows that CISA added it to the Known Exploited Vulnerabilities catalog on 2022-06-08 with a remediation due date of 2022-06-22. No additional technical specifics are provided in the supplied material, so this debrief avoids assumptions about affected versions, exploit vectors, or the exact security impact. The key defensive signal is the KEV status, which indicates active exploitation risk and the need to follow Microsoft’s update guidance.

Defensive priority

High. KEV inclusion is a strong indicator of active exploitation risk and warrants immediate patch management attention over routine maintenance work.

Recommended defensive actions

  • Inventory all Microsoft Office installations and confirm which systems may still be exposed.
  • Apply Microsoft updates or mitigations according to vendor instructions as soon as possible.
  • Validate that endpoint and software asset management processes can identify Office versions quickly.
  • Review document-handling controls and user exposure paths for Office files, especially on high-value systems.

Evidence notes

The only supplied authoritative evidence is the CISA KEV entry and its metadata. CISA lists the vulnerability as 'Microsoft Office Object Record Corruption Vulnerability,' marks it as known exploited, and records 'Apply updates per vendor instructions' as the required action. The KEV metadata also notes 'knownRansomwareCampaignUse: Unknown.' The supplied records reference the official CVE and NVD entries, but no additional technical details were provided in-corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2009-0557 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2009-0557

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

  • CVE-2009-0557 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2009-0557

    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.