CyberSecBulletin
CVE-2026-50647NVD status: Analyzed

Microsoft .NET Framework 3.5 AND 4.7.2: Loop with Unreachable Exit Condition

Published Updated By the CyberSecBulletin desk

CVE-2026-50647 is a high-severity loop with unreachable exit condition vulnerability in Microsoft .NET Framework 3.5 AND 4.7.2 from Microsoft, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 as the first without the flaw, so updating Microsoft .NET Framework 3.5 AND 4.7.2 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.17% chance of exploitation within 30 days, higher than 68% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Microsoft .NET Framework 3.5 AND 4.7.2 to 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 or a later version.
  2. Update Microsoft .NET Framework 3.5 AND 4.8 to 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 or a later version.
  3. Update Microsoft .NET Framework 3.5 AND 4.8.1 to 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 or a later version.
  4. Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.24.7.0 up to, but not including, 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.02.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
MicrosoftMicrosoft .NET Framework 3.5 AND 4.84.8.0 up to, but not including, 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.02.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8.14.8.1 up to, but not including, 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.02.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
MicrosoftMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.24.7.0 up to, but not including, 4.7.4143.04.7.4143.0
MicrosoftMicrosoft .NET Framework 4.84.8.0 up to, but not including, 4.8.4803.04.8.4803.0
MicrosoftMicrosoft .NET Framework 4.8.14.8.0.0 up to, but not including, 4.8.9340.04.8.9340.0
MicrosoftWindows 10 Version 160710.0.14393.0 up to, but not including, 10.0.14393.933910.0.14393.9339
MicrosoftWindows 10 Version 180910.0.17763.0 up to, but not including, 10.0.17763.902010.0.17763.9020
MicrosoftWindows 10 Version 21H210.0.19044.0 up to, but not including, 10.0.19044.754810.0.19044.7548
MicrosoftWindows 10 Version 22H210.0.19045.0 up to, but not including, 10.0.19045.754810.0.19045.7548
MicrosoftWindows 11 Version 24H210.0.26100.0 up to, but not including, 10.0.26100.887510.0.26100.8875
MicrosoftWindows 11 Version 25H210.0.26200.0 up to, but not including, 10.0.26200.887510.0.26200.8875
MicrosoftWindows 11 version 26H110.0.28000.0 up to, but not including, 10.0.28000.252510.0.28000.2525
MicrosoftWindows Server 20126.2.9200.0 up to, but not including, 6.2.9200.262266.2.9200.26226
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 up to, but not including, 6.2.9200.262266.2.9200.26226
MicrosoftWindows Server 2012 R26.3.9600.0 up to, but not including, 6.3.9600.232916.3.9600.23291
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 up to, but not including, 6.3.9600.232916.3.9600.23291
MicrosoftWindows Server 201610.0.14393.0 up to, but not including, 10.0.14393.933910.0.14393.9339
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 up to, but not including, 10.0.14393.933910.0.14393.9339
MicrosoftWindows Server 201910.0.17763.0 up to, but not including, 10.0.17763.902010.0.17763.9020
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 up to, but not including, 10.0.17763.902010.0.17763.9020
MicrosoftWindows Server 202210.0.20348.0 up to, but not including, 10.0.20348.538610.0.20348.5386
MicrosoftWindows Server 202510.0.26100.0 up to, but not including, 10.0.26100.3315810.0.26100.33158
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 up to, but not including, 10.0.26100.3315810.0.26100.33158
MicrosoftWindows 10 1607before 10.0.14393.933910.0.14393.9339

Version data comes from the organisation that assigned the CVE; 7 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (microsoft.com).

Official description

Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Loop with Unreachable Exit Condition

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

More Loop with Unreachable Exit Condition vulnerabilities (CWE-835)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Microsoft .NET Framework 3.5 AND 4.7.2

All Microsoft .NET Framework 3.5 AND 4.7.2 vulnerabilities

Recent Loop with Unreachable Exit Condition vulnerabilities

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