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Vulnerabilities

Vulnerability · CVE-2018-8627

Microsoft Excel Use of Uninitialized Resource

Published Jan 21, 2021 · catalog updated Jan 21, 2021 · Microsoft Excel

Patch now

CVE-2018-8627 is in the CISA known-exploited catalog. Confirm Microsoft Excel against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
8.62%
Remediation
Remediation guidance
Affected products
vendor Microsoft Excel

An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Excel Information Disclosure Vulnerability." This affects Microsoft Office, Office 365 ProPlus, Microsoft Excel, Microsoft Excel Viewer, Excel. This CVE ID is unique from CVE-2018-8598.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Excelversion unspecified

How to fix CVE-2018-8627

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2018-8627 is in the CISA known-exploited catalog. Confirm Microsoft Excel against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 8.62%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 21, 2021 · VulnCheck KEV

    Detected

    An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Excel Information Disclosure Vulnerability." This affects Microsoft Office, Office 365 ProPlus, Microsoft Excel, Microsoft Excel Viewer, Excel. This CVE ID is unique from CVE-2018-8598.

  2. Jan 21, 2021 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2018-8627

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-8627

    30-day exploitation probability 8.6%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2018-8627

    An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Excel Information Disclosure Vulnerability." This affects Microsoft Office, Office

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.