How severe is CVE-2017-11878?

CVE-2017-11878 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-2017-11878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-11878?

CVE-2017-11878 primarily affects Microsoft Excel. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-11878?

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-2017-11878 published?

CVE-2017-11878 was published on 2017-11-15 and last updated on 2026-06-17.

CVE-2017-11878

CVE-2017-11878 is a high-severity vulnerability in Microsoft Excel with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. 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: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Excel
Published: 2017-11-15
Last modified: 2026-06-17

Description

Microsoft Excel 2007 Service Pack 3, Microsoft Excel 2010 Service Pack 2, Microsoft Excel 2013 Service Pack 1, Microsoft Excel 2013 RT Service Pack 1, Microsoft Excel 2016, Microsoft Office Compatibility Pack Service Pack 3, and Microsoft Excel Viewer 2007 Service Pack 3 allow an attacker to run arbitrary code in the context of the current user by failing to properly handle objects in memory, aka "Microsoft Excel Memory Corruption Vulnerability".

Frequently asked questions

What is CVE-2017-11878?: Microsoft Excel 2007 Service Pack 3, Microsoft Excel 2010 Service Pack 2, Microsoft Excel 2013 Service Pack 1, Microsoft Excel 2013 RT Service Pack 1, Microsoft Excel 2016, Microsoft Office Compatibility Pack Service Pack 3, and Microsoft Excel Viewer 2007 Service Pack 3 allow an attacker to run arbitrary code in the context of the current user by failing to properly handle objects in memory, aka "Microsoft Excel Memory Corruption Vulnerability".
How severe is CVE-2017-11878?: CVE-2017-11878 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-2017-11878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-11878?: CVE-2017-11878 primarily affects Microsoft Excel. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-11878?: 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-2017-11878 published?: CVE-2017-11878 was published on 2017-11-15 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:microsoft:excel:2007:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2010:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2013:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2013:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel_viewer:2007:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_compatibility_pack:-:sp3:*:*:*:*:*:*

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