Vulnerability record

CVE-2017-8759

Microsoft .NET Framework Remote Code Execution Vulnerability

HighExploitation confirmedCISA KEV

What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run .NET Framework, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by May 3, 2022.

Patch status

Official fix available since Sep 30, 2026

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Patch or advisory on portal.msrc.microsoft.com (opens in a new tab)

Description

Microsoft .NET Framework 2.0, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 allow an attacker to execute code remotely via a malicious document or application, aka ".NET Framework Remote Code Execution Vulnerability."

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

Products affected by this vulnerability, with versions and the source of each entry
Product	Vendor	Affected versions	Source
.NET Framework	Microsoft	4.5.2; 3.5.1; 3.5; 2.0; 4.6.1; 4.6	KEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog.

Intelligence timeline

Developments from the last 30 days, newest first.

CVSS scoredUpdateKEVSep 30, 2026
CVE-2017-8759 scored CVSS 7.8: Microsoft .NET Framework, Microsoft .NET Framework Remote Code Execution Vulnerability
CISA lists this as exploited in the wild. Unpatched .NET Framework systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
Patch releasedUpdateKEVSep 30, 2026
Patch released for CVE-2017-8759: Microsoft .NET Framework, Microsoft .NET Framework Remote Code Execution Vulnerability
An official fix is now available for Microsoft .NET Framework. This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2017-8759
securityfocus.com http://www.securityfocus.com/bid/100742
securitytracker.com http://www.securitytracker.com/id/1039324
github.com https://github.com/GitHubAssessments/CVE_Assessments_01_2020
github.com https://github.com/bhdresh/CVE-2017-8759
github.com https://github.com/nccgroup/CVE-2017-8759
portal.msrc.microsoft.com https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8759
exploit-db.com https://www.exploit-db.com/exploits/42711/
cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-8759