0x800F0821

CBS_E_ABORT

hresultdecimal 2148468769signed -2146498527Servicing and component store

Matched as: the code as given (hex)

HRESULT breakdown: code: 2081, customer: False, facility: 15, severity: failure (bit 31 set), ntstatus_wrapped: False

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Microsoft guidance: 0x800f0821 (CBS_E_ABORT) untested here · 0 fixed, 0 not

risk: unknown

Error text on Microsoft's page: client abort, IDABORT returned by ICbsUIHandler method except Error() CBS transaction timeout exceeded.

A servicing operation is taking a long time to finish. The servicing stack watchdog timer expires. Extending the timeout mitigates the issue. Increase the resources on the device. If it's a virtual machine, increase virtual CPU and memory to speed up operations. Make sure that the device has installed the update in KB4493473 or later.

Source: vendor, Common Windows Update errors

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Source: Common Windows Update errors · CC-BY-4.0 (MicrosoftDocs/SupportArticles-docs, repo license verified 2026-10-09) · retrieved 2026-10-09