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CVE-2018-8587

40
FAUCET Score

CVE-2018-8587 is a remote code execution vulnerability in Microsoft Outlook, affecting Office 365 ProPlus and Microsoft Office, stemming from improper memory object handling. It carries a CVSS score of 7.8 (High), indicating a significant risk with high impact on confidentiality, integrity, and availability, requiring user interaction for exploitation. Although not listed in CISA's KEV catalog, this vulnerability was reportedly exploited as a zero-day, with media coverage confirming its active use at the time of discovery. Despite its past exploitation, there are no public Metasploit, Nuclei, or ExploitDB modules available, though community discussion and media coverage suggest notable attention.

Impacted Technologies

VendorProductVersion(s)CPE
2010CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:*
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:*:*
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:*
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
28.78%
Probability of exploitation in next 30 days
EPSS Percentile
97.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.2878 is in the 98th percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (12)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 32-bit editions
microsoftpatch availablevia msrc
Product: Microsoft Office 2019 for 64-bit editions
microsoftpatch availablevia msrc
Product: Office 365 ProPlus for 32-bit Systems
microsoftpatch availablevia msrc
Product: Office 365 ProPlus for 64-bit Systems
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2016 (32-bit edition)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2016 (64-bit edition)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 Service Pack 1 (32-bit editions)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 Service Pack 1 (64-bit editions)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2010 Service Pack 2 (32-bit editions)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2010 Service Pack 2 (64-bit editions)
View patch
microsoftpatch availablevia msrc
Product: Microsoft Outlook 2013 RT Service Pack 1

Vendor Advisories (1)

microsoft2018-Dec/CVE-2018-8587Important

Microsoft Outlook Remote Code Execution Vulnerability

Dec 11, 2018

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2018-8587
PatchVendor Advisory
securityfocus.com / bid/106097
Third Party AdvisoryVDB Entry