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PatchSiren cyber security CVE debrief

CVE-2024-49138 Microsoft CVE debrief

CVE-2024-49138 is a Microsoft Windows vulnerability in the Common Log File System (CLFS) driver involving a heap-based buffer overflow. CISA added it to the Known Exploited Vulnerabilities catalog on 2024-12-10, which makes it a high-priority issue for defenders. The safest response is to follow Microsoft’s update guidance and remediate affected Windows systems as soon as possible.

Vendor
Microsoft
Product
Windows
CVSS
HIGH 7.8
CISA KEV
Listed
Original CVE published
2024-12-10
Original CVE updated
2024-12-10
Advisory published
2024-12-10
Advisory updated
2024-12-10

Who should care

Windows administrators, endpoint and vulnerability management teams, incident responders, and security teams responsible for Microsoft patching and fleet risk reduction.

Technical summary

The supplied records identify a heap-based buffer overflow in the Windows CLFS driver. Because the affected component is a Windows driver, the issue sits in a privileged operating-system path and should be treated as a serious memory-corruption vulnerability. The corpus does not provide a CVSS score, exploit details, or confirmation of ransomware usage, so defensive guidance should stay anchored to Microsoft and CISA remediation instructions.

Defensive priority

Urgent. CISA listed this CVE in the Known Exploited Vulnerabilities catalog on 2024-12-10 with a remediation due date of 2024-12-31, so affected systems should be prioritized immediately.

Recommended defensive actions

  • Apply Microsoft security updates or mitigations for CVE-2024-49138 as soon as they are available.
  • Inventory Windows systems to identify any hosts that may rely on the CLFS driver path.
  • Prioritize internet-facing, high-value, and endpoint fleets for remediation first.
  • Track Microsoft’s update guide for any product-specific remediation steps or prerequisites.
  • If mitigations are not available for a given environment, follow CISA’s guidance to discontinue use of the product or component where feasible.

Evidence notes

All statements are derived from the supplied CVE metadata, CISA KEV metadata, and the official Microsoft, NVD, and CVE links. The corpus does not include a CVSS score or validated exploit-chain detail. CISA metadata marks known ransomware campaign use as Unknown.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-49138 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-49138

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

  • CVE-2024-49138 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-49138

    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.