How severe is CVE-2017-8743?

CVE-2017-8743 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-8743 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8743?

CVE-2017-8743 primarily affects Microsoft Office Online Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-8743?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-8743 published?

CVE-2017-8743 was published on 2017-09-13 and last updated on 2026-06-17.

CVE-2017-8743

CVE-2017-8743 is a high-severity vulnerability in Microsoft Office Online Server with a CVSS 3.x base score of 7.8. Its EPSS exploit-prediction score of 21% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 9.3
EPSS exploit prediction: 21% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Office Online Server
Published: 2017-09-13
Last modified: 2026-06-17

Description

A remote code execution vulnerability exists in Microsoft PowerPoint 2016, Microsoft SharePoint Enterprise Server 2016, and Office Online Server when they fail to properly handle objects in memory, aka "PowerPoint Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-8742.

Frequently asked questions

What is CVE-2017-8743?: A remote code execution vulnerability exists in Microsoft PowerPoint 2016, Microsoft SharePoint Enterprise Server 2016, and Office Online Server when they fail to properly handle objects in memory, aka "PowerPoint Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-8742.
How severe is CVE-2017-8743?: CVE-2017-8743 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-8743 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 21% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8743?: CVE-2017-8743 primarily affects Microsoft Office Online Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-8743?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-8743 published?: CVE-2017-8743 was published on 2017-09-13 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:powerpoint:2016:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:*:*:*:*

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