Vulnerability CVE-2021-26423

Vulnerability Name:

CVE-2021-26423 (CCN-206379)

Assigned:

2021-08-10

Published:

2021-08-10

Updated:

2021-08-19

Summary:

.NET Core and Visual Studio Denial of Service Vulnerability

CVSS v3 Severity:

7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: 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)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: 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)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

7.5 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (REDHAT Temporal CVSS v3.1 Vector: 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)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

CVSS v2 Severity:

5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

Vulnerability Type:

CWE-noinfo
CWE-835

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2021-26423

Source: XF
Type: UNKNOWN
ms-dotnet-cve202126423-dos(206379)

Source: CCN
Type: Microsoft Security TechCenter - August 2021
.NET Core Denial of Service Vulnerability

Source: N/A
Type: Patch, Vendor Advisory
N/A

Vulnerable Configuration:

Configuration 1:

cpe:/a:microsoft:.net:*:*:*:*:*:*:*:* (Version >= 5.0 and <= 5.0.8)

OR cpe:/a:microsoft:.net_core:*:*:*:*:*:*:*:* (Version >= 2.1 and <= 2.1.28)

OR cpe:/a:microsoft:.net_core:*:*:*:*:*:*:*:* (Version >= 3.1 and <= 3.1.17)

OR cpe:/a:microsoft:powershell_core:*:*:*:*:*:*:*:* (Version >= 7.0 and < 7.0.7)

OR cpe:/a:microsoft:powershell_core:*:*:*:*:*:*:*:* (Version >= 7.1 and < 7.1.4)

OR cpe:/a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:* (Version >= 15.0 and <= 15.9)

OR cpe:/a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*

OR cpe:/a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* (Version >= 16.0 and <= 16.10)

Configuration RedHat 1:

cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

Configuration RedHat 2:

cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

Configuration CCN 1:

cpe:/a:microsoft:.net_core:2.1:-:*:*:*:*:*:*

OR cpe:/a:microsoft:.net_core:3.1:-:*:*:*:*:*:*

OR cpe:/a:microsoft:.net_core:5.0:-:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.redhat.rhsa:def:20213148	P	RHSA-2021:3148: .NET 5.0 security and bugfix update (Important)	2021-08-12
oval:com.redhat.rhsa:def:20213142	P	RHSA-2021:3142: .NET Core 3.1 security and bugfix update (Important)	2021-08-11

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