CVE-2021-1871
Apple iOS, iPadOS, and macOS Remote Code Execution - [Actively Exploited]
Description
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
INFO
Published Date :
April 2, 2021, 7:15 p.m.
Last Modified :
Feb. 28, 2025, 2:44 p.m.
Source :
product-security@apple.com
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2021-1871
Public PoC/Exploit Available at Github
CVE-2021-1871 has a 2 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-1871
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-1871.
| URL | Resource |
|---|---|
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ | Mailing List |
| https://support.apple.com/en-us/HT212146 | Vendor Advisory Release Notes |
| https://support.apple.com/en-us/HT212147 | Vendor Advisory Release Notes |
| https://www.debian.org/security/2021/dsa-4923 | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ | Mailing List |
| https://support.apple.com/en-us/HT212146 | Vendor Advisory Release Notes |
| https://support.apple.com/en-us/HT212147 | Vendor Advisory Release Notes |
| https://www.debian.org/security/2021/dsa-4923 | Mailing List Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-1871 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-1871 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by nvd@nist.gov
Feb. 28, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions from (including) 10.15 from (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions from (excluding) 14.4 *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions from (excluding) 14.4 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0.1 from (excluding) 11.2 *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:* OR *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions from (including) 10.15 from (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* versions from (excluding) 14.4 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions from (excluding) 14.4 *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0.1 from (excluding) 11.2 *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:* Changed Reference Type CVE: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Types: Release Notes CVE: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Types: Mailing List Changed Reference Type Apple Inc.: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Types: Release Notes Apple Inc.: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Types: Mailing List Changed Reference Type CVE: https://support.apple.com/en-us/HT212146 Types: Vendor Advisory CVE: https://support.apple.com/en-us/HT212146 Types: Release Notes, Vendor Advisory Changed Reference Type Apple Inc.: https://support.apple.com/en-us/HT212146 Types: Vendor Advisory Apple Inc.: https://support.apple.com/en-us/HT212146 Types: Release Notes, Vendor Advisory Changed Reference Type CVE: https://support.apple.com/en-us/HT212147 Types: Vendor Advisory CVE: https://support.apple.com/en-us/HT212147 Types: Release Notes, Vendor Advisory Changed Reference Type Apple Inc.: https://support.apple.com/en-us/HT212147 Types: Vendor Advisory Apple Inc.: https://support.apple.com/en-us/HT212147 Types: Release Notes, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Added Reference https://support.apple.com/en-us/HT212146 Added Reference https://support.apple.com/en-us/HT212147 Added Reference https://www.debian.org/security/2021/dsa-4923 -
Modified Analysis by nvd@nist.gov
Jul. 26, 2024
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ No Types Assigned https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Release Notes Changed Reference Type https://www.debian.org/security/2021/dsa-4923 Third Party Advisory https://www.debian.org/security/2021/dsa-4923 Mailing List, Third Party Advisory Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
May. 16, 2024
Action Type Old Value New Value Changed Vulnerability Name Apple iOS, iPadOS, and macOS Remote Code Execution Vulnerability Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability -
CVE Modified by product-security@apple.com
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by product-security@apple.com
Nov. 07, 2023
Action Type Old Value New Value Added Reference Apple Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ [No types assigned] Removed Reference Apple Inc. https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ -
Modified Analysis by nvd@nist.gov
Apr. 26, 2022
Action Type Old Value New Value Changed Reference Type https://www.debian.org/security/2021/dsa-4923 No Types Assigned https://www.debian.org/security/2021/dsa-4923 Third Party Advisory Changed CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by product-security@apple.com
May. 31, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4923 [No Types Assigned] -
Reanalysis by nvd@nist.gov
Apr. 19, 2021
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0.1 up to (excluding) 11.2 OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* versions from (including) 10.15 up to (excluding) 10.15.7 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0.1 up to (excluding) 11.2 -
Initial Analysis by nvd@nist.gov
Apr. 12, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ No Types Assigned https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ Mailing List, Third Party Advisory Changed Reference Type https://support.apple.com/en-us/HT212146 No Types Assigned https://support.apple.com/en-us/HT212146 Vendor Advisory Changed Reference Type https://support.apple.com/en-us/HT212147 No Types Assigned https://support.apple.com/en-us/HT212147 Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4 *cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* *cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* *cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* versions from (including) 11.0.1 up to (excluding) 11.2 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by product-security@apple.com
Apr. 04, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-1871 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-1871
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.00 }} -2.78%
score
0.74938
percentile