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NVD / CVE Program· CNA microsoft

CVE-2026-50647: Active Directory Federation Server Denial of Service Vulnerability

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.1% (FIRST EPSS); higher than 67.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0.

Low priority for now. Upgrade to Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 14, 2026
Updated
Oct 8, 2026
EPSS
1.1% · 67th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-50647

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftwindows 10 1607
microsoftwindows 10 1809
microsoftwindows 10 21h2
microsoftwindows 10 22h2
microsoftwindows 11 24h2
microsoftwindows 11 25h2
microsoftwindows 11 26h1
microsoftwindows server 2012
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022
microsoftwindows server 2025

and 2 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2012all versions
  • microsoft windows server 2012r2
  • microsoft windows server 2016before 10.0.14393.9339
  • microsoft windows server 2019before 10.0.17763.9020
  • microsoft windows server 2022before 10.0.20348.5386
  • microsoft windows server 2025before 10.0.26100.33158

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2

    • 4.7.0 and later · before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0affected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.8

    • 4.8.0 and later · before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0affected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1

    • 4.8.1 and later · before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0affected

  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2

    • 4.7.0 and later · before 4.7.4143.0affected

  • Microsoft Microsoft .NET Framework 4.8

    • 4.8.0 and later · before 4.8.4803.0affected

  • Microsoft Microsoft .NET Framework 4.8.1

    • 4.8.0.0 and later · before 4.8.9340.0affected

  • Microsoft Windows 10 Version 1607

    • 10.0.14393.0 and later · before 10.0.14393.9339affected

  • Microsoft Windows 10 Version 1809

    • 10.0.17763.0 and later · before 10.0.17763.9020affected

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.7548affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.7548affected

  • Microsoft Windows 11 Version 24H2

    • 10.0.26100.0 and later · before 10.0.26100.8875affected

  • Microsoft Windows 11 Version 25H2

    • 10.0.26200.0 and later · before 10.0.26200.8875affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-33824Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution VulnerabilityKEV
    92Now
  • CVE-2018-8174A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka "Windows VBScript Engine RemKEV
    86Now
  • CVE-2026-21510Windows Shell Security Feature Bypass VulnerabilityKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-50509Jul 14, 2026 · Wireless Wide Area Network Service (WwanSvc) Elevation of Privilege Vulnerability
    32Monitor
  • ← EarlierCVE-2026-50518Jul 14, 2026 · Windows DHCP Server Remote Code Execution Vulnerability
    39Monitor
  • Later →CVE-2026-50655Jul 14, 2026 · Microsoft Windows Media Foundation Remote Code Execution Vulnerability
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 · KB5099535Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 · KB5099535Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 · KB5100989Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 · KB5100989Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 20162.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 · KB5099535Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 · KB5099535Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 20192.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 · KB5100989Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 · KB5100989Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 · KB5101008Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 · KB5101008Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101006Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 20192.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 · KB5101008Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 · KB5101008Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 20222.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101010Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 · KB5101010Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101000Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101004Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101004Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101001Microsoft (MSRC)
Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · KB5101001Microsoft (MSRC)

+45

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-541190 days apartWindows Active Directory Denial of Service Vulnerability
    30Monitor
  • CVE-2026-503240 days apartWindows Active Directory Federation Services Denial of Service Vulnerability
    23Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records