Patch tracker / KB5002679

KB5002679: Office Online Server Security Update (February 2025)

KB5002679 is a High security update for Office Online Server, released 2025-02-11. It closes 5 CVEs with a maximum CVSS of 7.8. It is the 17th largest of the 25 updates Microsoft shipped that month, by CVEs closed.

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Update summary

High
2025-02-11
Released
5
CVEs fixed
7.8
Max CVSS v3
High
Severity
Deploy this cycle
Fixes 5 CVEs for Office Online Server. No confirmed in-the-wild exploitation in this set today.

Fixes 5 CVEs. Most severe CVSS 7.8 (High). EPSS exploit probability up to 1.1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Office Online Server has shipped since this one: KB5002928 (2026-10-13). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5002679Microsoft support article
Senserva AI Opinion for KB5002679

KB5002679 is a February 2025 update covering Office Online Server alongside Office 2019, fixing five separate CVEs at up to High severity, CVSS 7.8. Because it spans both a server-side Office Online role and desktop Office 2019, exposure includes both application servers and end-user machines. None of the five CVEs is currently in CISA KEV or tied to ransomware, but five distinct issues in one release is worth prioritizing over smaller updates.

Do this: Patch both Office Online Server and Office 2019 endpoints with KB5002679.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5002679

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5002679

Released
2025-02-11
Last changed
2026-09-26
Changes tracked
2

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5002679 is installed

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CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2025-21381High7.81.1%No
CVE-2025-21386High7.81.1%No
CVE-2025-21387High7.81.1%No
CVE-2025-21390High7.81.1%No
CVE-2025-21394High7.81.1%No

Scope and sources

Affected products
Also released in February 2025

KB5051974

32 CVEs · High · exploited

KB5051979

34 CVEs · High · exploited

KB5051980

34 CVEs · High · exploited

KB5051987

38 CVEs · High · exploited

KB5051989

32 CVEs · High · exploited

KB5052000

34 CVEs · High · exploited

KB5052006

33 CVEs · High · exploited

KB5052016

21 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002679 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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