Patch tracker / KB5068331
KB5068331: ASP.NET Core 8.0 Security Update (October 2025)
KB5068331 is a Critical security update for ASP.NET Core 8.0, released 2025-10-14. It closes 3 CVEs with a maximum CVSS of 9.9. The most likely of them to be attacked is CVE-2025-55247, which FIRST.org rates at 66% probability of exploitation in the next 30 days.
Update summary
Fixes 3 CVEs. Most severe CVSS 9.9 (Critical). EPSS exploit probability up to 66%. Among the top 25% of tracked Microsoft updates by EPSS exploit probability.
A newer security update for .NET 8.0 installed on Linux has shipped since this one: KB5077862 (2026-02-10). 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.
KB5068331 patches three CVEs across .NET 8.0 and 9.0 on Linux and ASP.NET Core 8.0, topping out at Critical severity with a CVSS of 9.9 and an EPSS of 66 percent. The Linux runtime coverage is notable because these are server side web application stacks rather than desktop Windows components, so exposure lands on your ASP.NET Core hosts and any Linux boxes running .NET workloads. The 66 percent EPSS indicates meaningful near term exploitation probability even though none of these CVEs are in the CISA KEV catalog or tied to ransomware.
Do this: Inventory your Linux hosts and ASP.NET Core services running .NET 8.0 or 9.0 and apply the updated runtime and SDK packages from this release.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5068331
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5068331
- Released
- 2025-10-14
- Last changed
- 2025-10-14
- 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 KB5068331 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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2025-55315 | Critical | 9.9 | 66% | No |
| CVE-2025-55247 | High | 7.3 | 66% | No |
| CVE-2025-55248 | Medium | 4.8 | 66% | No |
Scope and sources
- Affected products
- Also released in October 2025
KB5070879
1 CVE · Critical · exploitedKB5070881
1 CVE · Critical · exploitedKB5070882
1 CVE · Critical · exploitedKB5070883
1 CVE · Critical · exploitedKB5070884
1 CVE · Critical · exploitedKB5070886
1 CVE · Critical · exploitedKB5070887
1 CVE · Critical · exploitedKB5070892
1 CVE · Critical · 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.