CVE-2021-30661

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-30661
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.8 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References
Link Resource
https://support.apple.com/en-us/HT212317 Vendor Advisory
https://support.apple.com/en-us/HT212318 Vendor Advisory
https://support.apple.com/en-us/HT212323 Vendor Advisory
https://support.apple.com/en-us/HT212324 Vendor Advisory
https://support.apple.com/en-us/HT212325 Vendor Advisory
https://support.apple.com/en-us/HT212341 Vendor Advisory
https://support.apple.com/en-us/HT212317 Vendor Advisory
https://support.apple.com/en-us/HT212318 Vendor Advisory
https://support.apple.com/en-us/HT212323 Vendor Advisory
https://support.apple.com/en-us/HT212324 Vendor Advisory
https://support.apple.com/en-us/HT212325 Vendor Advisory
https://support.apple.com/en-us/HT212341 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 Third Party Advisory US Government Resource
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
History

23 Oct 2025, 14:53

Type Values Removed Values Added
References () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 - () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 - Third Party Advisory, US Government Resource

22 Oct 2025, 00:17

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 -

21 Oct 2025, 20:18

Type Values Removed Values Added
References
  • {'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661', 'source': '134c704f-9b21-4f2e-91b3-4a467353bcc0'}

21 Oct 2025, 19:19

Type Values Removed Values Added
References
  • () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661 -

21 Nov 2024, 06:04

Type Values Removed Values Added
References () https://support.apple.com/en-us/HT212317 - Vendor Advisory () https://support.apple.com/en-us/HT212317 - Vendor Advisory
References () https://support.apple.com/en-us/HT212318 - Vendor Advisory () https://support.apple.com/en-us/HT212318 - Vendor Advisory
References () https://support.apple.com/en-us/HT212323 - Vendor Advisory () https://support.apple.com/en-us/HT212323 - Vendor Advisory
References () https://support.apple.com/en-us/HT212324 - Vendor Advisory () https://support.apple.com/en-us/HT212324 - Vendor Advisory
References () https://support.apple.com/en-us/HT212325 - Vendor Advisory () https://support.apple.com/en-us/HT212325 - Vendor Advisory
References () https://support.apple.com/en-us/HT212341 - Vendor Advisory () https://support.apple.com/en-us/HT212341 - Vendor Advisory

17 Sep 2021, 14:31

Type Values Removed Values Added
CPE cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
CWE CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : 6.8
v3 : 8.8
References (MISC) https://support.apple.com/en-us/HT212341 - (MISC) https://support.apple.com/en-us/HT212341 - Vendor Advisory
References (MISC) https://support.apple.com/en-us/HT212325 - (MISC) https://support.apple.com/en-us/HT212325 - Vendor Advisory
References (MISC) https://support.apple.com/en-us/HT212324 - (MISC) https://support.apple.com/en-us/HT212324 - Vendor Advisory
References (MISC) https://support.apple.com/en-us/HT212318 - (MISC) https://support.apple.com/en-us/HT212318 - Vendor Advisory
References (MISC) https://support.apple.com/en-us/HT212323 - (MISC) https://support.apple.com/en-us/HT212323 - Vendor Advisory
References (MISC) https://support.apple.com/en-us/HT212317 - (MISC) https://support.apple.com/en-us/HT212317 - Vendor Advisory

08 Sep 2021, 15:30

Type Values Removed Values Added
New CVE
Information

Published : 2021-09-08 15:15

Updated : 2025-10-23 14:53

NVD link : CVE-2021-30661

Mitre link : CVE-2021-30661

CVE.ORG link : CVE-2021-30661

JSON object : View

Products Affected

apple

  • tvos
  • ipados
  • safari
  • macos
  • watchos
  • iphone_os
CWE
CWE-416

Use After Free