Microsoft Outlook Application Crash due to UCRTBASE.DLL

Anonymous
2020-12-07T17:43:25+00:00

Windows 10 Build 2004

Outlook crashes intermittently and generates the following Application Event Log error.

Event 1000, Application Error (11:06AM, 12/7/2020) Faulting application name: OUTLOOK.EXE, version: 16.0.13426.20308, time stamp: 0x5fc6ea9b Faulting module name: ucrtbase.dll, version: 10.0.19041.546, time stamp: 0x73123758 Exception code: 0xc0000409 Fault offset: 0x0009edbb Faulting process id: 0x41c0 Faulting application start time: 0x01d6ccaedccaa9fa Faulting application path: C:\Program Files (x86)\Microsoft Office\root\Office16\OUTLOOK.EXE Faulting module path: C:\WINDOWS\System32\ucrtbase.dll Report Id: f8791f7b-faf7-452a-8ff2-7268662a6db2 Faulting package full name: Faulting package-relative application ID:

I have run SFC /SCANNOW

I have completely uninstalled and reinstalled Microsoft Office 365

Here are the properties of the failing file:

Windows for home | Windows 10 | Performance and system failures

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  1. Anonymous
    2021-01-25T19:38:22+00:00

    The Exploit Mitigation component is still enabled, only Outlook is excepted for a temporary period untill Sophos fixes the cause.

    I verified that Outlook did not crash while Sophos was uninstalled.  I reinstalled Sophos at the end of the day on 1/21/2021.  After reporting this to Sophos they sent me the same hotfix you mentioned above.  I went ahead and added the same exclusion for Microsoft Outlook to Exploit Mitigation and will monitor the results for the remainder of the day today.

    I put the same Microsoft Outlook exclusion for Sophos Exploit Protection in on Friday, and have not had one crash since.  I have updated my Sophos ticket to indicate this and the first thing they sent me was the hotfix you mentioned above.  I installed the hotfix but, since it has already been demonstrated that the hotfix does not resolve the issue with Microsoft Outlook, left the Microsoft Outlook exclusion in place.  Waiting for further follow-up from Sophos support.

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  2. Anonymous
    2021-01-22T13:54:33+00:00

    We also have Sophos Endpoint, I noticed that exploit mitigation screws up a few applications we use lately. Every problem we had with apps crashing or hangings were lead back to the exploit mitigation function.

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  3. Anonymous
    2021-01-22T13:37:44+00:00

    The Exploit Mitigation component is still enabled, only Outlook is excepted for a temporary period untill Sophos fixes the cause.

    I verified that Outlook did not crash while Sophos was uninstalled.  I reinstalled Sophos at the end of the day on 1/21/2021.  After reporting this to Sophos they sent me the same hotfix you mentioned above.  I went ahead and added the same exclusion for Microsoft Outlook to Exploit Mitigation and will monitor the results for the remainder of the day today.

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  4. Anonymous
    2021-01-22T12:03:36+00:00

    The Exploit Mitigation component is still enabled, only Outlook is excepted for a temporary period untill Sophos fixes the cause.

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  5. Anonymous
    2021-01-22T11:59:10+00:00

    So far so good... Still no new crashes of Outlook within our organization.

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