CVE-2021-34448 : Scripting Engine Memory Corruption Vulnerability

Products affected by CVE-2021-34448

Microsoft » Windows Server 2008 » Version: R2 Update SP1 For X64
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
Matching versions
Microsoft » Windows 7 » Version: N/A Update SP1
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2012 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2012 » Version: R2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
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Microsoft » Windows 8.1 » Version: N/A
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
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Microsoft » Windows Rt 8.1 » Version: N/A
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
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Microsoft » Windows Server 2016
Versions before (<) 10.0.14393.4530
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2019
Versions before (<) 10.0.17763.2061
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
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Microsoft » Windows 10 1607
Versions before (<) 10.0.14393.4530
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 21h1
Versions before (<) 10.0.19043.1110
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 1809
Versions before (<) 10.0.17763.2061
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 20h2
Versions before (<) 10.0.19042.1110
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 1507
Versions before (<) 10.0.10240.19003
cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 1909
Versions before (<) 10.0.18363.1679
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 2004
Versions before (<) 10.0.19041.1110
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*
Matching versions

CVE-2021-34448 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:

Microsoft Windows Scripting Engine Memory Corruption Vulnerability

CISA required action:

Apply updates per vendor instructions.

CISA description:

Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2021-34448

Added on 2021-11-03 Action due date 2021-11-17

Exploit prediction scoring system (EPSS) score for CVE-2021-34448

EPSS FAQ

1.78%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 88 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-34448

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
9.3	HIGH	AV:N/AC:M/Au:N/C:C/I:C/A:C	8.6	10.0	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High
6.8	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N	1.6	5.2	Microsoft Corporation
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: None

CWE ids for CVE-2021-34448

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-34448