CVE-2020-0618Known exploitationPublic exploitNetwork attack vector

Authenticated code execution via unsigned ViewState deserialization

Published Feb 11, 2020 · Updated Aug 15, 2026

Deserialization in Microsoft SQL Server Reporting Services allows remote authenticated users to execute code via a crafted page request. The ReportViewer.aspx NavigationCorrector control accepts an unsigned ASP.NET ViewState blob and deserializes attacker-controlled objects. Windows-authenticated access to SSRS is required, and successful exploitation runs code with Report Server service-account privileges.

CVSS severity8.8
High
EPSS probability99.02%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Microsoft SQL Server Reporting Services allows remote authenticated users to execute code via a crafted page request. The ReportViewer.aspx NavigationCorrector control accepts an unsigned ASP.NET ViewState blob and deserializes attacker-controlled objects. Windows-authenticated access to SSRS is required, and successful exploitation runs code with Report Server service-account privileges.

The record

CVE
CVE-2020-0618
Published
Feb 11, 2020
Updated
Aug 15, 2026
Vendor
Microsoft
Product
Microsoft SQL Server
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record 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 for 32-bit Systems Service Pack 4 (QFE)
  2. Affected versionversion=2012 for x64-based Systems Service Pack 4 (QFE)
  3. Affected versionversion=2016 for x64-based Systems Service Pack 2 (CU)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft SQL Serverversion=2012 for 32-bit Systems Service Pack 4 (QFE); version=2012 for x64-based Systems Service Pack 4 (QFE); version=2016 for x64-based Systems Service Pack 2 (CU)
Microsoft · Microsoft SQL Server 2016version=unspecified
Microsoft · Microsoft SQL Server 2014version=unspecified

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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