CVE-2020-9947 — webkitgtk: use after free issue may lead to arbitrary code execution

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HIGH

webkitgtk: use after free issue may lead to arbitrary code execution

Published Dec 8, 2020

8.8

HIGH

CVSS 3.1

EPSS 1.80%

Description

A use after free issue was addressed with improved memory management. This issue is fixed in watchOS 7.0, iOS 14.0 and iPadOS 14.0, iTunes for Windows 12.10.9, iCloud for Windows 11.5, tvOS 14.0, Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

Vendor Apple Product Safari Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <14.0
Vendor Apple Product iCloud for Windows Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <11.5
Vendor Apple Product iOS and iPadOS Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <14.0
Vendor Apple Product iTunes for Windows Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <12.10
Vendor Apple Product tvOS Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <14.0
Vendor Apple Product watchOS Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <7.0

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Apple

Safari

n/a

Version	Status	Constraints
unspecified	affected	<14.0

Apple

iCloud for Windows

n/a

Version	Status	Constraints
unspecified	affected	<11.5

Apple

iOS and iPadOS

n/a

Version	Status	Constraints
unspecified	affected	<14.0

Apple

iTunes for Windows

n/a

Version	Status	Constraints
unspecified	affected	<12.10

Apple

tvOS

n/a

Version	Status	Constraints
unspecified	affected	<14.0

Apple

watchOS

n/a

Version	Status	Constraints
unspecified	affected	<7.0

Red Hat Enterprise Linux 7 Extended Lifecycle Support

webkitgtk4-0:2.48.3-2.el7_9

Fixed · RHSA-2025:10364
Red Hat Enterprise Linux 6

webkitgtk

Out of support scope
Red Hat Enterprise Linux 7

webkitgtk3

Out of support scope
Red Hat Enterprise Linux 8

webkit2gtk3

Fix deferred
Red Hat Enterprise Linux 9

webkit2gtk3

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 7 Extended Lifecycle Support	webkitgtk4-0:2.48.3-2.el7_9	Fixed	RHSA-2025:10364
Red Hat Enterprise Linux 6	webkitgtk	Out of support scope	n/a
Red Hat Enterprise Linux 7	webkitgtk3	Out of support scope	n/a
Red Hat Enterprise Linux 8	webkit2gtk3	Fix deferred	n/a
Red Hat Enterprise Linux 9	webkit2gtk3	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

1.80% 0.01797

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01797

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.80% (0.01797)	77.70th	v5 (v2026.06.15)
Jun 15, 2026	1.65% (0.01655)	73.43th	v5 (v2026.06.15)
Mar 17, 2025	0.66% (0.00660)	69.41th	v4 (v2025.03.14)
Dec 12, 2024	0.71% (0.00715)	81.18th	v3 (v2023.03.01)
Apr 27, 2024	0.39% (0.00386)	72.89th	v3 (v2023.03.01)
Feb 8, 2024	0.44% (0.00444)	74.17th	v3 (v2023.03.01)
Sep 3, 2023	0.44% (0.00444)	71.74th	v3 (v2023.03.01)
Mar 7, 2023	0.34% (0.00340)	66.82th	v3 (v2023.03.01)
Mar 6, 2023	19.92% (0.19916)	96.41th	v2 (v2022.01.01)
Feb 4, 2022	19.92% (0.19916)	93.93th	v2 (v2022.01.01)
Feb 3, 2022	2.28% (0.02281)	50.99th	v5 (v2026.06.15)
Apr 14, 2021	2.03% (0.02031)	0.00th	v1

Weaknesses (1)

CWE-416

Use After Free

References (13)

http://www.openwall.com/lists/oss-security/2021/03/22/1
mailing-listx_refsource_MLISTMailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2020-9947
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944331
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-9947
https://security.gentoo.org/glsa/202104-03
vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://support.apple.com/en-us/HT211843
x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211844
x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211845
x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211850
x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211935
x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211952
x_refsource_MISCRelease NotesVendor Advisory
https://webkitgtk.org/security/WSA-2021-0002.html
https://www.cve.org/CVERecord?id=CVE-2020-9947

Link	Providers	Tags
http://www.openwall.com/lists/oss-security/2021/03/22/1		mailing-listx_refsource_MLISTMailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2020-9947		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1944331		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-9947
https://security.gentoo.org/glsa/202104-03		vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://support.apple.com/en-us/HT211843		x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211844		x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211845		x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211850		x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211935		x_refsource_MISCRelease NotesVendor Advisory
https://support.apple.com/en-us/HT211952		x_refsource_MISCRelease NotesVendor Advisory
https://webkitgtk.org/security/WSA-2021-0002.html
https://www.cve.org/CVERecord?id=CVE-2020-9947