Vulnerability CVE-2021-1796

Vulnerability Name:

CVE-2021-1796 (CCN-196030)

Assigned:

2020-12-08

Published:

2021-02-01

Updated:

2021-04-07

Summary:

An out-of-bounds write was addressed with improved input validation. This issue is fixed in iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution.

CVSS v3 Severity:

9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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): High Integrity (I): High Availibility (A): High

8.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
7.7 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

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

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

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

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

CWE-787

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2021-1796

Source: XF
Type: UNKNOWN
apple-ios-cve20211796-code-exec(196030)

Source: CCN
Type: Apple security document HT212146
About the security content of iOS 14.4 and iPadOS 14.4

Source: MISC
Type: Vendor Advisory
https://support.apple.com/en-us/HT212146

Vulnerable Configuration:

Configuration 1:

cpe:/o:apple:ipados:*:*:*:*:*:*:*:* (Version < 14.4)

OR cpe:/o:apple:iphone_os:*:*:*:*:*:*:*:* (Version < 14.4)

Configuration CCN 1:

cpe:/o:apple:ipados:14.3:*:*:*:*:*:*:*

OR cpe:/o:apple:ios:14.3:*:*:*:*:*:*:*

Denotes that component is vulnerable

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