BREACH WATCH BRIEF High 🐛 Advisory

Microsoft Ends Support for Office 2021 – Five Options for Organizations

Microsoft will stop providing security updates for Office 2021 on 13 Oct 2024, leaving the product exposed to future vulnerabilities. This highlights the need for robust patch‑management controls and audit‑ready evidence of remediation plans.

ADTP Breach Watch · October 6, 2026 · ZDNet Security

SeverityHigh

Type🐛 Advisory

ConfidenceHigh

ReportedOct 6, 2026

Technology & SaaS Enterprises and SMBs using Office 2021 across all industries Vulnerability Exploit Other

What happened

Microsoft announced that Office 2021 will no longer receive technical support, bug fixes, or security patches after 13 Oct 2024. The software will still run, but any new vulnerabilities will remain unpatched.

Why it matters for trust and compliance

The situation tests the control objective of maintaining up‑to‑date software, a single control that maps to many frameworks and underpins continuous‑control‑assurance programs.
Identify and document the patch‑management gap to satisfy audit evidence requirements.
Map the remediation plan to your framework of record for continuous assurance.

Who is affected

Enterprises and SMBs using Office 2021 across all industries

Recommended actions

Inventory Office 2021 installations, assess risk, and plan migration to a supported suite.
Capture evidence of the upgrade decision and risk‑acceptance for audit readiness.

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