Vulnerability · Published Aug 11, 2026 · Assigned by microsoft
CVE-2026-62878Windows DNS Server Remote Code Execution Vulnerability
Critical 9.8
In plain English
A critical-severity stack buffer overflow in Windows Server 2012 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.0%top 37.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows Server 2012 | 6.2.9200.0 – before 6.2.9200.26280 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – before 6.2.9200.26280 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – before 6.3.9600.23338 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – before 6.3.9600.23338 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.9418 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – before 10.0.14393.9418 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.9121 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.9121 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – before 10.0.20348.5499 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.33296 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.33296 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Windows DNS Server Remote Code Execution Vulnerability vendor-advisory, patch