Microsoft Windows Server 1903 up to Server 2016 DNS Server SigRed memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.8$0-$5k0.00

Summaryinfo

A vulnerability marked as very critical has been reported in Microsoft Windows. This vulnerability affects unknown code of the component DNS Server. Performing a manipulation results in memory corruption. This vulnerability is known as CVE-2020-1350. Remote exploitation of the attack is possible. Furthermore, an exploit is available. This vulnerability is considered historic because of its background and reception. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Microsoft Windows (Operating System). It has been classified as very critical. This affects an unknown code of the component DNS Server. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.

The weakness was published 07/14/2020 by Sagi Tzadik and Eyal Itkin with Check Point as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release has been coordinated with Microsoft. This vulnerability is uniquely identified as CVE-2020-1350. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/17/2025). Due to its background and reception, this vulnerability has a historic impact. The advisory points out:

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the Local System Account. Windows servers that are configured as DNS servers are at risk from this vulnerability.

A public exploit has been developed by maxpl0it in Python and been published 2 days after the advisory. The exploit is shared for download at github.com. It is declared as attacked. We expect the 0-day to have been worth approximately $100k and more. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Applying a patch is able to eliminate this problem. It is possible to mitigate the problem by applying the configuration setting reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters" /v "TcpReceivePacketSize" /t REG_DWORD /d 0xFF00 /f. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Further details are available at msrc-blog.microsoft.com. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.8

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 10.0
Vendor Vector (Microsoft): 🔍

NVD Base Score: 10.0
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Author: maxpl0it
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Exploit Delay Time: 🔍

Config: reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters" /v "TcpReceivePacketSize" /t REG_DWORD /d 0xFF00 /f
Workaround: support.microsoft.com

Timelineinfo

11/04/2019 🔍
07/14/2020 +253 days 🔍
07/14/2020 +0 days 🔍
07/15/2020 +1 days 🔍
07/16/2020 +1 days 🔍
12/17/2025 +1980 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: Sagi Tzadik, Eyal Itkin
Organization: Check Point
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2020-1350 (🔍)
GCVE (CVE): GCVE-0-2020-1350
GCVE (VulDB): GCVE-100-157875
scip Labs: https://www.scip.ch/en/?labs.20140213
Misc.: 🔍

Entryinfo

Created: 07/15/2020 07:49
Updated: 12/17/2025 19:09
Changes: 07/15/2020 07:49 (60), 07/17/2020 07:38 (2), 07/17/2020 07:39 (22), 10/29/2020 13:56 (1), 04/19/2024 18:59 (32), 07/08/2024 19:21 (1), 09/09/2024 22:29 (2), 02/08/2025 00:25 (1), 12/17/2025 19:09 (1)
Complete: 🔍
Committer: misc
Cache ID: 216::103

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