CVE-2020-0610Public exploitNetwork attack vector

Unauthenticated code execution via unchecked fragment index

Published Jan 14, 2020 · Updated Aug 4, 2024

Remote code execution in Microsoft Windows Server 2012, 2012 R2, 2016, and 2019 RD Gateway allows remote attackers to execute code via UDP. The UDP reassembly handler accepts fragment_id values above its 64-entry tracking array and writes TRUE beyond that array. No authentication or user interaction is required; reachability requires enabled RD Gateway UDP transport, normally on UDP/3391, and successful exploitation runs code with SYSTEM privileges.

CVSS severity9.8
Critical
EPSS probability67.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Windows Server 2012, 2012 R2, 2016, and 2019 RD Gateway allows remote attackers to execute code via UDP. The UDP reassembly handler accepts fragment_id values above its 64-entry tracking array and writes TRUE beyond that array. No authentication or user interaction is required; reachability requires enabled RD Gateway UDP transport, normally on UDP/3391, and successful exploitation runs code with SYSTEM privileges.

The record

CVE
CVE-2020-0610
Published
Jan 14, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Windows Server
Classifications
T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2012
  2. Affected versionversion=2012 R2
  3. Affected versionversion=2016
  4. Affected versionversion=2019

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Serverversion=2012; version=2012 R2; version=2016; version=2019

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0CERT/CCAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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