MSRC_CVE-2026-23666

Vulnerability from csaf_microsoft - Published: 2026-04-14 07:00 - Updated: 2026-04-14 07:00
Summary
.NET Framework Denial of Service Vulnerability
Severity
Critical
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CVE-2026-23666
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CWE-755 - Improper Handling of Exceptional Conditions
Vendor Fix 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082411 https://support.microsoft.com/help/5082411
Vendor Fix 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082403 https://support.microsoft.com/help/5082403
Vendor Fix 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082404 https://support.microsoft.com/help/5082404
Vendor Fix 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082414 https://support.microsoft.com/help/5082414
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082427 https://support.microsoft.com/help/5082427
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082426 https://support.microsoft.com/help/5082426
Vendor Fix 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0:Security Update:https://support.microsoft.com/help/5082413 https://support.microsoft.com/help/5082413
Vendor Fix 4.8.4801.0:Security Update:https://support.microsoft.com/help/5082400 https://support.microsoft.com/help/5082400
Vendor Fix 4.7.4141.0:Security Update:https://support.microsoft.com/help/5082402 https://support.microsoft.com/help/5082402
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082425 https://support.microsoft.com/help/5082425
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082419 https://support.microsoft.com/help/5082419
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082424 https://support.microsoft.com/help/5082424
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082417 https://support.microsoft.com/help/5082417
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082418 https://support.microsoft.com/help/5082418
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082420 https://support.microsoft.com/help/5082420
Vendor Fix 2.0.50727.8982 & 3.0.30729.8976:Security Update:https://support.microsoft.com/help/5082398 https://support.microsoft.com/help/5082398
Vendor Fix 2.0.50727.8982 & 3.0.30729.8976:Security Update:https://support.microsoft.com/help/5082406 https://support.microsoft.com/help/5082406
Vendor Fix 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0:Security Update:https://support.microsoft.com/help/5082421 https://support.microsoft.com/help/5082421
References
Acknowledgments
Anonymous
To clipboard 

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      "cwe": {
        "id": "CWE-755",
        "name": "Improper Handling of Exceptional Conditions"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
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      ],
      "product_status": {
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        },
        {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "PROOF_OF_CONCEPT",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.7,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
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      "threats": [
        {
          "category": "impact",
          "details": "Denial of Service"
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        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": ".NET Framework Denial of Service Vulnerability"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.