CVE-2026-83520 (GCVE-0-2026-83520)
Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-14 03:56
VLAI
EPSS
VEX
Title
.NET Remote Code Execution Vulnerability
Summary
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 00:00 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
14 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.13
(custom)
|
guessed | |
| Microsoft | .NET 11.0 |
Affected:
11.0.0 , < 11.0.0-rc.2
(custom)
|
guessed | |
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.32
(custom)
|
guessed | |
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.21
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 |
Affected:
3.5.0 , < 2.0.50727.9188 AND 3.0.30729.9171
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 |
Affected:
3.0.0.0 , < 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 |
Affected:
4.7.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 |
Affected:
4.8.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 |
Affected:
4.8.1 , < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 |
Affected:
4.7.0 , < 4.7.4150.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 4.8 |
Affected:
4.8.0 , < 4.8.4811.0
(custom)
|
guessed | |
| Microsoft | Microsoft .NET Framework 4.8.1 |
Affected:
4.8.0.0 , < 4.8.9363.0
(custom)
|
guessed | |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.42
(custom)
|
guessed | |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 |
Affected:
18.10.0 , < 18.10.4
(custom)
|
guessed |
Date Public
2026-10-13 14:00
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]
},
{
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],
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}
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},
{
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],
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}
]
},
{
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"Windows 10 version 21H2",
"Windows 10 version 22H2",
"Windows Server 2019",
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],
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"versions": [
{
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}
]
},
{
"platforms": [
"Windows 10 version 21H2",
"Windows 10 version 22H2",
"Windows 11 version 23H2",
"Windows 11 version 24H2",
"Windows 11 version 25H2",
"Windows 11 version 26H2",
"Windows Server 2022",
"Windows Server 2025"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0",
"status": "affected",
"version": "4.8.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 R2"
],
"product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
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},
{
"platforms": [
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"Windows Server 2012",
"Windows Server 2012 R2",
"Windows Server 2016"
],
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},
{
"platforms": [
"Windows 11 version 26H1"
],
"product": "Microsoft .NET Framework 4.8.1",
"vendor": "Microsoft",
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{
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"status": "affected",
"version": "4.8.0.0",
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}
]
},
{
"product": "Microsoft Visual Studio 2022 version 17.14",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "17.14.42",
"status": "affected",
"version": "17.14.0",
"versionType": "custom"
}
]
},
{
"product": "Microsoft Visual Studio 2026 version 18.10",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "18.10.4",
"status": "affected",
"version": "18.10.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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},
{
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},
{
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},
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},
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},
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{
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},
{
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},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
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],
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],
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"descriptions": [
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}
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"providerMetadata": {
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"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
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],
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}
],
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},
"cveMetadata": {
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"datePublished": "2026-10-13T19:01:15.820Z",
"dateReserved": "2026-08-31T15:57:21.155Z",
"dateUpdated": "2026-10-14T03:56:52.829Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.