Apple iOS < 14.4.2 XSS (HT212256)

medium Nessus Plugin ID 148263
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The version of Apple iOS running on the mobile device is missing a vendor-supplied patch.


The version of Apple iOS running on the mobile device is prior to 14.4.2. It is, therefore, affected by a cross-site scripting (XSS) vulnerability in its WebKit component due to improper validation of user-supplied input before returning it to users. An unauthenticated, remote attacker can exploit this, by convincing a user to click a specially crafted URL, to execute arbitrary script code in a user's browser session.


Upgrade to Apple iOS version 14.4.2 or later

See Also

Plugin Details

Severity: Medium

ID: 148263

File Name: apple_ios_1442_check.nbin

Version: 1.7

Type: local

Published: 4/1/2021

Updated: 11/22/2021

Dependencies: mdm_dependency_lock.nbin

Risk Information

CVSS Score Source: CVE-2021-1879


Risk Factor: High

Score: 7


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:apple:iphone_os

Required KB Items: mdm/dependency/unlocked

Exploit Ease: No known exploits are available

Patch Publication Date: 3/26/2021

Vulnerability Publication Date: 3/26/2021

Reference Information

CVE: CVE-2021-1879

APPLE-SA: APPLE-SA-2021-03-26-1, HT212256

IAVA: 2021-A-0153-S