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Windows Server 2008Operating system · Microsoft

CVE-2025-49672

HIGH · 8.8 CVSS v3.1 Published 2025-07-08
Fix available
A fix is available. Upgrade to 10.0.14393.8246 / 10.0.17763.7558 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthenticated remote attacker to execute arbitrary code by overflowing a heap buffer in the RRAS service.

MitigationApply Microsoft security updates for this vulnerability immediately; if patches are unavailable, consider disabling or restricting the RRAS service and implementing network segmentation to limit attack surface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Windows Server 2008Operating system
Affected:all versions= r2
Windows Server 2012Operating system
Affected:all versions= r2
Windows Server 2016Operating system
Affected:< 10.0.14393.8246
Windows Server 2019Operating system
Affected:< 10.0.17763.7558
Windows Server 2022Operating system
Affected:< 10.0.20348.3932
Windows Server 2022 23h2Operating system
Affected:< 10.0.25398.1732
Windows Server 2025Operating system
Affected:< 10.0.26100.4652

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify RRAS service status
    Open Services console (services.msc) or run 'Get-Service RemoteAccess' in PowerShell. Check if the RemoteAccess service is running or set to start.
    Affected if RRAS/RemoteAccess service is installed and running - the vulnerability only affects systems with RRAS enabled
  2. Check Windows version and build number
    Run 'winver' from command line or use PowerShell: [System.Environment]::OSVersion.Version. For more detail, run 'systeminfo | findstr /C:"OS Version"' or check the registry key HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    Affected if The OS version falls within the affected product list and is below the fixed build numbers
  3. Compare build number against fixed versions
    Identify the full build number (e.g., 10.0.14393.8246 for Server 2016). For Server 2016, compare against 10.0.14393.8246; Server 2019 against 10.0.17763.7558; Server 2022 against 10.0.20348.3932; Server 2022 23h2 against 10.0.25398.1732; Server 2025 against 10.0.26100.4652. Server 2008 and 2012 are all versions affected.
    Affected if Build number is lower than the fixed version for your Windows Server release, or if running Server 2008/2012 any version

System is affected if RRAS/RemoteAccess service is enabled and the Windows Server version/build is below the fixed version for that release.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 10.0.14393.8246 / 10.0.17763.7558 / 10.0.20348.3932 or later
Fixed in 10.0.14393.824610.0.17763.755810.0.20348.3932
Interim mitigation

Apply Microsoft security updates for this vulnerability immediately; if patches are unavailable, consider disabling or restricting the RRAS service and implementing network segmentation to limit attack surface.

Recommended fix High confidence

Windows Server 2016: upgrade to build 10.0.14393.8246 or later | Windows Server 2019: upgrade to build 10.0.17763.7558 or later | Windows Server 2022: upgrade to build 10.0.20348.3932 or later | Windows Server 2022 23h2: upgrade to build 10.0.25398.1732 or later | Windows Server 2025: upgrade to bui

  1. 1. Identify the current Windows Server version by running 'winver' or 'systeminfo' in Command Prompt
  2. 2. Determine if your server version is among the affected versions listed (Windows Server 2016, 2019, 2022, 2022 23h2, or 2025)
  3. 3. For Windows Server 2016, 2019, 2022, 2022 23h2, and 2025: Apply the appropriate Microsoft security update from Windows Update or Microsoft Update Catalog that addresses CVE-2025-49672
  4. 4. After patching, verify the RRAS service is functioning normally and confirm the update installed successfully via Windows Update history
  5. 5. For Windows Server 2008 and 2012 (end-of-life): These versions are no longer supported and cannot receive patches; migration to a supported Windows Server version is required
Caveat Windows Server 2008 and 2012 are end-of-life and cannot be patched; requires migration to a supported OS version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Windows Server 2008 Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-49672 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data