CVE-2020-9952

An input validation issue was addressed with improved input validation. This issue is fixed in iOS 14.0 and iPadOS 14.0, tvOS 14.0, watchOS 7.0, Safari 14.0, iCloud for Windows 11.4, iCloud for Windows 7.21. Processing maliciously crafted web content may lead to a cross site scripting attack.

Published: 2020-10-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-9952 is rated Moderate Risk (53.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.48%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-9952

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.62% 1.48% +0.85%
2 2026-05-17 0.50% 0.62% +0.13%
3 2025-12-24 — 0.50% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-9952

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L 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:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 3.7 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:P 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:P)
Partial availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2020-9952

OS Trackers for CVE-2020-9952

vendor priority summary link
alpine high CVE-2020-9952: 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-2020-9952
debian not yet assigned CVE-2020-9952 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-2020-9952
gentoo normal CVE-2020-9952: 1 GLSA(s) (202012-10), 1 atom(s) (net-libs/webkit-gtk); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-9952
redhat medium — https://access.redhat.com/security/cve/CVE-2020-9952
suse high CVE-2020-9952 severity important: SUSE including 135 source package names (WebKit2GTK-4.1-lang-2.36.0-150400.2.13, WebKit2GTK-5.0-lang-2.36.0-150400.2.12, …), 426 product×package rows across 59 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (59 product lines)): Fixed 423, Known Not Affected 3. https://www.suse.com/security/cve/CVE-2020-9952/
ubuntu medium CVE-2020-9952 medium priority: Ubuntu including 6 source packages (qtwebkit, qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk, wpewebkit), 78 status rows across 13 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): DNE 41, ignored 22, not-affected 8, needs-triage 4, released 3. https://ubuntu.com/security/CVE-2020-9952

Affected software / configurations for CVE-2020-9952

Vendor Product Version Raw CPE
apple icloud < 7.21 cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:*
apple icloud >= 11.0, < 11.4 cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:*
apple safari < 14.0 cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
apple ipados < 14.0 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 14.0 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple tvos < 14.0 cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos < 7.0 cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
webkit webkitgtk\+ <= 2.30.3 cpe:2.3:a:webkit:webkitgtk\+:*:*:*:*:*:*:*:*

References for CVE-2020-9952

URL Tags
http://seclists.org/fulldisclosure/2020/Nov/18 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/23/3 Mailing List
https://security.gentoo.org/glsa/202012-10 Third Party Advisory
https://support.apple.com/HT211843 Release Notes Vendor Advisory
https://support.apple.com/HT211844 Release Notes Vendor Advisory
https://support.apple.com/HT211845 Release Notes Vendor Advisory
https://support.apple.com/HT211846 Release Notes Vendor Advisory
https://support.apple.com/HT211847 Release Notes Vendor Advisory
https://support.apple.com/HT211850 Vendor Advisory
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