CVE-2021-1825 [Medium] | XSS in Icloud

An input validation issue was addressed with improved input validation. This issue is fixed in iTunes 12.11.3 for Windows, iCloud for Windows 12.3, macOS Big Sur 11.3, Safari 14.1, watchOS 7.4, tvOS 14.5, iOS 14.5 and iPadOS 14.5. Processing maliciously crafted web content may lead to a cross site scripting attack.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.61%	1.26%	-0.34%
2	2026-06-14	0.48%	1.61%	+1.12%
3	2026-05-31	—	0.48%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.61%

1.26%

-0.34%

2026-06-14

0.48%

1.61%

+1.12%

2026-05-31

—

0.48%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

OS Trackers for CVE-2021-1825

vendor	priority	summary	link
`alpine`	medium	CVE-2021-1825: 1 source package rows (webkit2gtk); 5 state rows across 5 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, edge-community); fixed 5, open 0.	https://security.alpinelinux.org/vuln/CVE-2021-1825
`debian`	not yet assigned	CVE-2021-1825 not yet assigned priority: Debian including 2 source packages (webkit2gtk, wpewebkit), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10.	https://security-tracker.debian.org/tracker/CVE-2021-1825
`gentoo`	high	CVE-2021-1825: 1 GLSA(s) (202202-01), 1 atom(s) (net-libs/webkit-gtk); latest impact high.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-1825
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2021-1825
`ubuntu`	medium	CVE-2021-1825 medium priority: Ubuntu including 5 source packages (qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk, wpewebkit), 60 status rows across 12 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): DNE 27, ignored 20, released 10, needs-triage 3.	https://ubuntu.com/security/CVE-2021-1825

Affected software / configurations for CVE-2021-1825

Vendor	Product	Version	Raw CPE
apple	icloud	< 12.3	cpe:2.3:a:apple:icloud::::::windows::*
apple	itunes	< 12.11.3	cpe:2.3:a:apple:itunes::::::windows::*
apple	safari	< 14.1	cpe:2.3:a:apple:safari::::::::
apple	ipados	< 14.5	cpe:2.3:o:apple:ipados::::::::
apple	iphone_os	< 14.5	cpe:2.3:o:apple:iphone_os::::::::
apple	macos	>= 11.0, < 11.3	cpe:2.3:o:apple:macos::::::::
apple	tvos	< 14.5	cpe:2.3:o:apple:tvos::::::::
apple	watchos	< 7.4	cpe:2.3:o:apple:watchos::::::::

References for CVE-2021-1825

URL	Tags
https://support.apple.com/en-us/HT212317	Vendor Advisory
https://support.apple.com/en-us/HT212318	Vendor Advisory
https://support.apple.com/en-us/HT212319	Vendor Advisory
https://support.apple.com/en-us/HT212321	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

URL

CVE-2021-1825

Exploit prediction scoring system (EPSS) score for CVE-2021-1825

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1825

Weakness enumeration for CVE-2021-1825

OS Trackers for CVE-2021-1825

Affected software / configurations for CVE-2021-1825

References for CVE-2021-1825