---
id: CVE-2026-62878
title: Windows DNS Server Remote Code Execution Vulnerability
summary: >-
  Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to
  execute code over a network.
severity: critical
cvss: 9.8
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-121
vendor: Microsoft
product: Windows Server 2012
affected:
  - windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280
  - windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280
  - windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338
  - >-
    windows_server_2012_r2_server_core_installation >= 6.3.9600.0 <
    6.3.9600.23338
  - windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418
  - >-
    windows_server_2016_server_core_installation >= 10.0.14393.0 <
    10.0.14393.9418
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.9121
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33296
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:57:32.715986Z'
exploitAvailable: true
published: '2026-08-11'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:44:54.785Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62878'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62878'
    label: Windows DNS Server Remote Code Execution Vulnerability
tags:
  - cve.org
  - exploit-available
epss: 0.0126
epssPercentile: 0.68343
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/nmlz/CVE-2026-62878'
  checkedAt: '2026-09-24T14:44:56.018Z'
ingestedAt: '2026-09-08T18:07:34.898Z'
---

## Overview

Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.

## Affected

- `windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280`
- `windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280`
- `windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338`
- `windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23338`
- `windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418`
- `windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9418`
- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.