How severe is CVE-2017-8663?

CVE-2017-8663 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-2017-8663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8663?

CVE-2017-8663 primarily affects Microsoft Outlook. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-8663?

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-2017-8663 published?

CVE-2017-8663 was published on 2017-08-01 and last updated on 2026-06-17.

CVE-2017-8663

CVE-2017-8663 is a high-severity vulnerability in Microsoft Outlook with a CVSS 3.x base score of 7.8. Its EPSS exploit-prediction score of 20% 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: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Outlook
Published: 2017-08-01
Last modified: 2026-06-17

Description

Microsoft Outlook 2007 SP3, Outlook 2010 SP2, Outlook 2013 SP1, Outlook 2013 RT SP1, and Outlook 2016 as packaged in Microsoft Office allows a remote code execution vulnerability due to the way Microsoft Outlook parses specially crafted email messages, aka "Microsoft Office Outlook Memory Corruption Vulnerability"

Frequently asked questions

What is CVE-2017-8663?: Microsoft Outlook 2007 SP3, Outlook 2010 SP2, Outlook 2013 SP1, Outlook 2013 RT SP1, and Outlook 2016 as packaged in Microsoft Office allows a remote code execution vulnerability due to the way Microsoft Outlook parses specially crafted email messages, aka "Microsoft Office Outlook Memory Corruption Vulnerability"
How severe is CVE-2017-8663?: CVE-2017-8663 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-2017-8663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8663?: CVE-2017-8663 primarily affects Microsoft Outlook. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-8663?: 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-2017-8663 published?: CVE-2017-8663 was published on 2017-08-01 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:microsoft:outlook:2007:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2010:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*

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