Critical Microsoft Exchange Flaw: What is CVE-2021-26855? | UpGuard
ID: 71fc7f66-c800-57ec-9637-f58d55c4c468
STIX ID: report--71fc7f66-c800-57ec-9637-f58d55c4c468
Feed Name: UpGuard Blog
Threat Score
Hafnium exploited four Microsoft Exchange Server zero-day vulnerabilities beginning 6 January 2021, resulting in widespread compromises (≈60,000 organizations) via chained SSRF-to-RCE flaws, web shells and data exfiltration; Microsoft released patches on 2 March 2021 and the report provides IOC, detection, patching and CISA response guidance.
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