CVE-2017-11774

CVE-2017-11774 is a high-severity vulnerability in Microsoft Outlook with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-119.

Key facts

Description

Microsoft Outlook 2010 SP2, Outlook 2013 SP1 and RT SP1, and Outlook 2016 allow an attacker to execute arbitrary commands, due to how Microsoft Office handles objects in memory, aka "Microsoft Outlook Security Feature Bypass Vulnerability."

Frequently asked questions

What is CVE-2017-11774?
Microsoft Outlook 2010 SP2, Outlook 2013 SP1 and RT SP1, and Outlook 2016 allow an attacker to execute arbitrary commands, due to how Microsoft Office handles objects in memory, aka "Microsoft Outlook Security Feature Bypass Vulnerability."
How severe is CVE-2017-11774?
CVE-2017-11774 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-2017-11774 being actively exploited?
Yes. CVE-2017-11774 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-11774?
CVE-2017-11774 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-2017-11774?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2017-11774 have an EU (EUVD) identifier?
Yes. CVE-2017-11774 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-3382. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2017-11774 published?
CVE-2017-11774 was published on 2017-10-13 and last updated on 2026-06-17.

References

Affected products (4)

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