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2021 Microsoft Exchange Server data breach

series of cyberattacks exploiting Microsoft's email and calendar server software
Event cyberattack Q105820537
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2021 Microsoft Exchange Server data breach

Summary

2021 Microsoft Exchange Server data breach is a cyberattack[1]. It draws 53 Wikipedia views per month (cyberattack category, ranking #18 of 39).[2]

Key Facts

  • 2021 Microsoft Exchange Server data breach's instance of is recorded as cyberattack[3].
  • 2021 Microsoft Exchange Server data breach's instance of is recorded as data breach[4].
  • 2021 Microsoft Exchange Server data breach's location is recorded as worldwide[5].
  • 2021 Microsoft Exchange Server data breach's target is recorded as Q223653[6].
  • 2021 Microsoft Exchange Server data breach's point in time is recorded as +2021-00-00T00:00:00Z[7].
  • 2021 Microsoft Exchange Server data breach's participant is recorded as HAFNIUM[8].
  • 2021 Microsoft Exchange Server data breach's BBC Things ID is recorded as 4478b194-d379-4796-b3b3-6b8f3b3b14d4[9].
  • 2021 Microsoft Exchange Server data breach's Google Knowledge Graph ID is recorded as /g/11r2rlz_gb[10].

Why It Matters

2021 Microsoft Exchange Server data breach draws 53 Wikipedia views per month (cyberattack category, ranking #18 of 39).[2] It has Wikipedia articles in 6 language editions, a strong signal of global cultural recognition.[11]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . blogs.microsoft.com. blogs.microsoft.com. Provenance: wikidata.org.
  7. [9] ↑ . BBC Things. wikidata.org.
  8. [10] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [11] ↑ . Wikidata sitelinks. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). 2021 Microsoft Exchange Server data breach. Retrieved May 3, 2026, from https://4ort.xyz/entity/2021-microsoft-exchange-server-data-breach
MLA “2021 Microsoft Exchange Server data breach.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/2021-microsoft-exchange-server-data-breach.
BibTeX @misc{4ortxyz_2021-microsoft-exchange-server-data-breach_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{2021 Microsoft Exchange Server data breach}}, year = {2026}, url = {https://4ort.xyz/entity/2021-microsoft-exchange-server-data-breach}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): 2021 Microsoft Exchange Server data breach — https://4ort.xyz/entity/2021-microsoft-exchange-server-data-breach (retrieved 2026-05-03)

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