What is the CVSS score of CVE-2018-8627?

CVE-2018-8627 has a CVSS 3.0 base score of 5.5 (Medium). CVSS vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. EPSS exploitation probability: 8.7%.

Is there a patch available for CVE-2018-8627?

Yes, a patch is available for CVE-2018-8627. Update the affected software to the latest version immediately.

Excel CVE-2018-8627

MEDIUM

Use of Uninitialized Resource (CWE-908)

2018-12-12 secure@microsoft.com

Information Disclosure Microsoft Excel Office Sharepoint Server Excel Viewer Office Compatibility Pack Office 365 Proplus

5.5

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-908 ASVS 5.0 V15 - Secure Coding and Architecture Variable initialization
Impact	CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived	A local attacker with access to the system could access uninitialized memory causing crashes or information disclosure. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 8.7% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 5.5), this vulnerability is no authentication required, low attack complexity. This Use of Uninitialized Resource vulnerability could allow attackers to access uninitialized memory causing crashes or information disclosure.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Initialize all variables, use compiler warnings for uninitialized access, use memory-safe languages.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Use of Uninitialized Resource (CWE-908), which allows attackers to access uninitialized memory causing crashes or information disclosure. 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. Affected products include: Microsoft Excel, Microsoft Excel Viewer, Microsoft Office, Microsoft Office 365 Proplus, Microsoft Office Compatibility Pack.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.5 MEDIUM

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

8.7%

Top 6% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 8.7%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +9

CVSS: +28

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:microsoft:excel:2010:sp2:*:*:*:*:*:*

cpe:2.3:a:microsoft:excel:2013:sp1:*:*:*:*:*:*

cpe:2.3:a:microsoft:excel:2013:sp1:*:*:rt:*:*:*

cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:excel_viewer:2007:sp3:*:*:*:*:*:*

cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:*

cpe:2.3:a:microsoft:office:2016:*:*:*:*:mac_os_x:*:*

cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:office:2019:*:*:*:*:macos:*:*

cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:office_compatibility_pack:-:sp3:*:*:*:*:*:*

cpe:2.3:a:microsoft:sharepoint_server:2010:sp2:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8627 REF http://www.securityfocus.com/bid/106120

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