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 ninth largest of the 17 updates Microsoft shipped that month, by CVEs closed.
Update summary
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.
A newer security update for Office Online Server has shipped since this one: KB5002884 (2026-08-11). 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.
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
- 2025-02-11
- Changes tracked
- 1
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
Elevated PowerShell. No output means it is not installed.
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2025-21381 | High | 7.8 | 1.1% | No |
| CVE-2025-21386 | High | 7.8 | 1.1% | No |
| CVE-2025-21387 | High | 7.8 | 1.1% | No |
| CVE-2025-21390 | High | 7.8 | 1.1% | No |
| CVE-2025-21394 | High | 7.8 | 1.1% | No |
Scope and sources
- Affected products
- Also released in February 2025
KB5052016
21 CVEs · High · exploitedKB5052020
23 CVEs · High · exploitedKB5052032
20 CVEs · High · exploitedKB5052038
20 CVEs · High · exploitedKB5052042
23 CVEs · High · exploitedKB5052072
19 CVEs · High · exploitedKB5052105
37 CVEs · High · exploitedKB5052106
33 CVEs · High · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.