Patch tracker / KB5077473

KB5077473: Microsoft SQL Server 2017 for x64-base Security Update (March 2026)

KB5077473 is a High security update for Microsoft SQL Server 2017 for x64-base, released 2026-03-10. It closes 2 CVEs with a maximum CVSS of 8.8. It is the 23rd largest of the 38 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2026-03-10
Released
2
CVEs fixed
8.8
Max CVSS
High
Severity
Deploy this cycle
Fixes 2 CVEs for Microsoft SQL Server 2017 for x64-base. No confirmed in-the-wild exploitation in this set today.

Fixes 2 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.0%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

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A newer security update for Microsoft SQL Server 2017 for x64-based Systems (GDR) has shipped since this one: KB5101346 (2026-07-14). 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 KB5077473Microsoft support article
Senserva AI Opinion for KB5077473

KB5077473 patches two flaws (CVE-2026-21262 and CVE-2026-26115) across SQL Server 2016 SP3, 2017, and 2019 GDR branches, with a top rating of High and CVSS 8.8. Exposure is limited to organizations still running these older SQL Server versions on x64, and the 8.8 score suggests an attacker path that does not require the highest privilege level. Neither CVE is in CISA KEV or tied to ransomware, and EPSS is only 2 percent, so this is a patch-during-normal-cycle item rather than an emergency.

Do this: Inventory your SQL Server 2016 SP3, 2017, and 2019 instances and schedule the KB5077473 GDR update in your next maintenance window.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5077473

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

Full tracking and change history for KB5077473

Released
2026-03-10
Last changed
2026-03-10
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 KB5077473 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-2026-21262High8.82.0%No
CVE-2026-26115High8.82.0%No

Scope and sources

Affected products
Also released in March 2026

KB5002843

3 CVEs · High

KB5002845

4 CVEs · High

KB5002850

4 CVEs · High

KB5077464

2 CVEs · High

KB5077465

2 CVEs · High

KB5077466

3 CVEs · High

KB5077468

3 CVEs · High

KB5077469

2 CVEs · High

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5077473 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.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.