CVE-2017-8759
Published: November 3, 2021
Official Description
Microsoft .NET Framework contains a remote code execution vulnerability when processing untrusted input that could allow an attacker to take control of an affected system.
CISA KEV Advisory
Microsoft .NET Framework Remote Code Execution Vulnerability
Microsoft .NET Framework contains a remote code execution vulnerability when processing untrusted input that could allow an attacker to take control of an affected system.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Microsoft .NET Framework allows an attacker to execute arbitrary code remotely by processing specially crafted untrusted input. The high EPSS score of 0.93953 indicates a very high likelihood of exploitation, and its presence in CISA's KEV confirms active exploitation.
Active exploitation of this vulnerability has been observed in the wild. Attackers can exploit this remotely.
Apply the latest security updates and patches for Microsoft .NET Framework to address this remote code execution vulnerability.
Technical Analysis
CVE-2017-8759 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2017-8759 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2017-8759 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1