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Fencer Intel
high 7.8

CVE-2017-8759 kev in the critical feed json

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 docum…

published 2017-09-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-17705

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
88.7%
EPSS 88.7% chance of exploitation in 30 days, percentile 99.7%
public exploits
1
Exploit-DB

Summary

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."

Patch / fix

cisa required action Apply updates per vendor instructions.

Timeline

  1. 0-day patched (Project Zero)
  2. First public exploit (EDB-42711)
  3. Published
  4. Added to CISA KEV
  5. CISA patch deadline
  6. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2022-05-03 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, .NET Framework
CISA name
Microsoft .NET Framework Remote Code Execution Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2017-09-12
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

88.70% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-42711 Microsoft Windows .NET Framework - Remote Code Execution remote, 2017-09-13
  • github.com https://github.com/bhdresh/CVE-2017-8759 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/nccgroup/CVE-2017-8759 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Microsoft Corporation Microsoft .NET Framework

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.