Known Exploited Vulnerability
6.1
MEDIUM
CVE-2021-1879
Apple iOS, iPadOS, and watchOS Cross-Site Scriptin - [Actively Exploited]
Description

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. 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 :

Nov. 21, 2024, 5:45 a.m.

Remotely Exploitable :

Yes !

Impact Score :

2.7

Exploitability Score :

2.8
CISA Notification
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.

Description :

Apple iOS, iPadOS, and watchOS WebKit contain an unspecified vulnerability that allows for universal cross-site scripting (XSS) when processing maliciously crafted web content. 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.

Required Action :

Apply updates per vendor instructions.

Notes :

https://nvd.nist.gov/vuln/detail/CVE-2021-1879

Public PoC/Exploit Available at Github

CVE-2021-1879 has a 3 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-2021-1879 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.

ID Vendor Product Action
1 Apple iphone_os
2 Apple watchos
3 Apple ipados
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-2021-1879.

URL Resource
https://support.apple.com/en-us/HT212256 Vendor Advisory
https://support.apple.com/en-us/HT212257 Vendor Advisory
https://support.apple.com/en-us/HT212258 Vendor Advisory
https://support.apple.com/en-us/HT212256 Vendor Advisory
https://support.apple.com/en-us/HT212257 Vendor Advisory
https://support.apple.com/en-us/HT212258 Vendor 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).

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

Updated: 2 days, 23 hours ago
546 stars 34 fork 34 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1221 different CVEs too.

because people want to test it

HTML

Updated: 2 years, 11 months ago
1 stars 0 fork 0 watcher
Born at : Oct. 12, 2021, 12:47 p.m. This repo has been linked 1 different CVEs too.

NIST BULK CVE Lookup

Python

Updated: 1 year, 8 months ago
0 stars 0 fork 0 watcher
Born at : May 7, 2020, 11:23 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-1879 vulnerability anywhere in the article.

  • The Hacker News
Russian Hackers Exploit Safari and Chrome Flaws in High-Profile Cyberattack

Cybersecurity researchers have flagged multiple in-the-wild exploit campaigns that leveraged now-patched flaws in Apple Safari and Google Chrome browsers to infect mobile users with information-steali ... Read more

Published Date: Aug 29, 2024 (3 months ago)
  • BleepingComputer
Russian APT29 hackers use iOS, Chrome exploits created by spyware vendors

The Russian state-sponsored APT29 hacking group has been observed using the same iOS and Android exploits created by commercial spyware vendors in a series of cyberattacks between November 2023 and Ju ... Read more

Published Date: Aug 29, 2024 (3 months ago)
  • Google
State-backed attackers and commercial surveillance vendors repeatedly use the same exploits

Our latest n-day exploit reporting shows that in an attack on Mongolian government websites, Russian-backed APT29 is suspected of using the same exploits as Intellexa and NSO. We’re sharing details an ... Read more

Published Date: Aug 29, 2024 (3 months ago)

The following table lists the changes that have been made to the CVE-2021-1879 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.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://support.apple.com/en-us/HT212256
    Added Reference https://support.apple.com/en-us/HT212257
    Added Reference https://support.apple.com/en-us/HT212258
  • 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 watchOS Cross-Site Scripting (XSS) Vulnerability Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CPE Deprecation Remap by [email protected]

    Jan. 09, 2023

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions from (excluding) 14.4.2 OR *cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* versions from (excluding) 14.4.2
  • Initial Analysis by [email protected]

    Apr. 09, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type https://support.apple.com/en-us/HT212256 No Types Assigned https://support.apple.com/en-us/HT212256 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212257 No Types Assigned https://support.apple.com/en-us/HT212257 Vendor Advisory
    Changed Reference Type https://support.apple.com/en-us/HT212258 No Types Assigned https://support.apple.com/en-us/HT212258 Vendor Advisory
    Added CWE NIST CWE-79
    Added CPE Configuration OR *cpe:2.3:o:apple:ipad_os:*:*:*:*:*:*:*:* versions up to (excluding) 14.4.2 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions up to (excluding) 12.5.2 *cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* versions from (including) 13.0 up to (excluding) 14.4.2 *cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* versions up to (excluding) 7.3.3
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-1879 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-2021-1879 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.23 }} 0.01%

score

0.60941

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability