CVE-2025-47978: Windows Kerberos Denial of Service Vulnerability
CVE-2025-47978 is a denial of service vulnerability in Windows Kerberos, rated Important by Microsoft, with a CVSS 3.1 base score of 6.5 (Medium). An attacker can exploit it remotely over the network, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as more likely. The EPSS model estimates a 2.20% probability of exploitation activity in the next 30 days, higher than 83% of all scored vulnerabilities. Microsoft released the fix on 8 July 2025 in the July 2025 Patch Tuesday, delivered through 3 security updates (KB5062572, KB5062553, KB5062570). It affects 5 products in 1 product family (Windows).
Key facts
- CVE ID
- CVE-2025-47978
- Severity
- Medium CVSS 6.5
- Microsoft severity
- Important
- Impact
- Denial of Service
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- More Likely
- Weakness
- CWE-125
- EPSS
- 2.20% (percentile 83%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2025 Patch Tuesday
- Product families
- Windows
CVSS score and vector
Microsoft scores CVE-2025-47978 at 6.5 (temporal 5.7) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Out-of-bounds read in Windows Kerberos allows an authorized attacker to deny service over a network.
Affected products (5)
Windows
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Windows Server 2022 | KB5062572 | Security Update | 10.0.20348.3932 | Yes |
| Windows Server 2022 (Server Core installation) | KB5062572 | Security Update | 10.0.20348.3932 | Yes |
| Windows Server 2025 (Server Core installation) | KB5062553 | Security Update | 10.0.26100.4652 | Yes |
| Windows Server 2022, 23H2 Edition (Server Core installation) | KB5062570 | Security Update | 10.0.25398.1732 | Yes |
| Windows Server 2025 | KB5062553 | Security Update | 10.0.26100.4652 | Yes |
Security updates (3)
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 6.5 (MEDIUM)
- NVD weakness
- CWE-125
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| windows server 2022 | before 10.0.20348.3932 |
| windows server 2022 23h2 | before 10.0.25398.1732 |
| windows server 2025 | before 10.0.26100.4652 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47978 (Vendor Advisory)
Acknowledgments
- Dor Segal with Silverfort
- Eliran Partush with Silverfort
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |