NVD / CVE Program· CNA microsoft

CVE-2023-38180: .NET and Visual Studio Denial of Service Vulnerability

HighCVSS 7.5 · v3.1KEVWeaponized Fix available

Noroxi assessment

Priority: This week (action score 64/100)

CISA has confirmed exploitation in the wild (Aug 9, 2023). Remediation deadline for US federal agencies: Aug 30, 2023.
Probability of exploitation in the next 30 days: 14.1% (FIRST EPSS); higher than 96.6% 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: aspnetcore-runtime-6.0 (AlmaLinux:8) 6.0.21-1.el8_8; aspnetcore-runtime-7.0 (AlmaLinux:8) 7.0.10-1.el8_8; aspnetcore-targeting-pack-6.0 (AlmaLinux:8) 6.0.21-1.el8_8.

Don’t wait for the next maintenance window. Upgrade to aspnetcore-runtime-6.0 (AlmaLinux:8) 6.0.21-1.el8_8; aspnetcore-runtime-7.0 (AlmaLinux:8) 7.0.10-1.el8_8; aspnetcore-targeting-pack-6.0 (AlmaLinux:8) 6.0.21-1.el8_8 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 · CISA KEV · FIRST EPSS

Published: Aug 8, 2023
Updated: Nov 10, 2026
EPSS: 14.1% · 96th percentile
CWE: CWE-400

Report tools

JSON

Action score

This week

Don’t wait for the next maintenance window.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 4 / 30 · 14.1%

CISA SSVC decision

Exploitation: active
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:P/RL:O/RC:C

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

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 9, 2023. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Aug 30, 2023.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

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

Is your version affected? Check it

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.

Vendor	Product	CPE
microsoft	.net	cpe:2.3:a:microsoft:.net
microsoft	asp.net core	cpe:2.3:a:microsoft:asp.net_core
microsoft	visual studio 2022	cpe:2.3:a:microsoft:visual_studio_2022
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora

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 .NET 6.0
- 6.0.0 and later · before 6.0.21affected
Microsoft .NET 7.0
- 7.0.0 and later · before 7.0.10affected
Microsoft ASP.NET Core 2.1
- 2.0 and later · before 2.1.40affected
Microsoft Microsoft Visual Studio 2022 version 17.2
- 17.2.0 and later · before 17.2.18affected
Microsoft Microsoft Visual Studio 2022 version 17.4
- 17.4.0 and later · before 17.4.10affected
Microsoft Microsoft Visual Studio 2022 version 17.6
- 17.6.0 and later · before 17.6.6affected

Affected versions · NVD (8)

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

fedoraproject fedora37
fedoraproject fedora38
microsoft .net6.0.0 and later · before 6.0.21
microsoft .net7.0.0 and later · before 7.0.10
microsoft asp.net core2.1 and later · before 2.1.40
microsoft visual studio 202217.4.0 and later · before 17.4.10
microsoft visual studio 202217.6.0 and later · before 17.6.6
microsoft visual studio 202217.2.0 and later · before 17.2.18

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	aspnetcore-runtime-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	aspnetcore-runtime-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	aspnetcore-targeting-pack-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	aspnetcore-targeting-pack-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet	before 7.0.110-1.el8_8	7.0.110-1.el8_8
AlmaLinux:8	dotnet-apphost-pack-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	dotnet-apphost-pack-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet-host	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet-hostfxr-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	dotnet-hostfxr-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet-runtime-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	dotnet-runtime-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet-sdk-6.0	before 6.0.121-1.el8_8	6.0.121-1.el8_8
AlmaLinux:8	dotnet-sdk-6.0-source-built-artifacts	before 6.0.121-1.el8_8	6.0.121-1.el8_8
AlmaLinux:8	dotnet-sdk-7.0	before 7.0.110-1.el8_8	7.0.110-1.el8_8
AlmaLinux:8	dotnet-sdk-7.0-source-built-artifacts	before 7.0.110-1.el8_8	7.0.110-1.el8_8
AlmaLinux:8	dotnet-targeting-pack-6.0	before 6.0.21-1.el8_8	6.0.21-1.el8_8
AlmaLinux:8	dotnet-targeting-pack-7.0	before 7.0.10-1.el8_8	7.0.10-1.el8_8
AlmaLinux:8	dotnet-templates-6.0	before 6.0.121-1.el8_8	6.0.121-1.el8_8
AlmaLinux:8	dotnet-templates-7.0	before 7.0.110-1.el8_8	7.0.110-1.el8_8
AlmaLinux:8	netstandard-targeting-pack-2.1	before 7.0.110-1.el8_8	7.0.110-1.el8_8
AlmaLinux:9	aspnetcore-runtime-6.0	before 6.0.21-1.el9_2	6.0.21-1.el9_2
AlmaLinux:9	aspnetcore-runtime-7.0	before 7.0.10-1.el9_2	7.0.10-1.el9_2
AlmaLinux:9	aspnetcore-targeting-pack-6.0	before 6.0.21-1.el9_2	6.0.21-1.el9_2

+96

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2023-38171Microsoft QUIC Denial of Service Vulnerability
51Plan
CVE-2021-26701.NET Core Remote Code Execution Vulnerability
41Plan
CVE-2024-43498.NET and Visual Studio Remote Code Execution Vulnerability
40Plan

Published before and after this one in the same product

← EarlierCVE-2023-35391Aug 8, 2023 · ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability
31Monitor
← EarlierCVE-2023-38178Aug 8, 2023 · .NET Core and Visual Studio Denial of Service Vulnerability
31Monitor
Later →CVE-2023-36799Sep 12, 2023 · .NET Core and Visual Studio Denial of Service Vulnerability
27Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
almalinux:aspnetcore-runtime-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:aspnetcore-targeting-pack-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet	7.0.110-1.el8_8 · AlmaLinux:8	Package registry (OSV)
almalinux:dotnet-apphost-pack-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-host	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-hostfxr-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-runtime-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-sdk-7.0	7.0.110-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-sdk-7.0-source-built-artifacts	7.0.110-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-targeting-pack-7.0	7.0.10-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:dotnet-templates-7.0	7.0.110-1.el9_2 · AlmaLinux:9	Package registry (OSV)
almalinux:netstandard-targeting-pack-2.1	7.0.110-1.el9_2 · AlmaLinux:9	Package registry (OSV)
alpine:dotnet6-build	6.0.121-r0 · Alpine:v3.18	Package registry (OSV)
alpine:dotnet6-runtime	6.0.21-r0 · Alpine:v3.18	Package registry (OSV)
alpine:dotnet7-build	7.0.110-r0 · Alpine:v3.18	Package registry (OSV)
alpine:dotnet7-runtime	7.0.10-r0 · Alpine:v3.18	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-arm64	6.0.21	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-arm64	7.0.10	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-x64	6.0.21	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-x64	7.0.10	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-x86	6.0.21	Package registry (OSV)
NuGet:Microsoft.AspNetCore.App.Runtime.win-x86	7.0.10	Package registry (OSV)
NuGet:Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv	2.1.40	Package registry (OSV)
NuGet:Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv	6.0.21	Package registry (OSV)
NuGet:Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets	2.1.40	Package registry (OSV)
red hat:aspnetcore-runtime-6.0	0:6.0.21-1.el9_0 · Red Hat:rhel_eus:9.0::appstream	Package registry (OSV)
red hat:aspnetcore-targeting-pack-6.0	0:6.0.21-1.el9_0 · Red Hat:rhel_eus:9.0::appstream	Package registry (OSV)
red hat:dotnet-apphost-pack-6.0	0:6.0.21-1.el9_0 · Red Hat:rhel_eus:9.0::appstream	Package registry (OSV)
red hat:dotnet-apphost-pack-6.0-debuginfo	0:6.0.21-1.el9_0 · Red Hat:rhel_eus:9.0::appstream	Package registry (OSV)
red hat:dotnet-host	0:6.0.21-1.el9_0 · Red Hat:rhel_eus:9.0::appstream	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

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.

PublishedAug 8, 2023
CISA KEVAug 9, 2023same day
TodayNov 14, 2026+1194 d

EPSS, last 120 days

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

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38180

Show all references (3 more)

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

All records