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ubuntucveUbuntu.comUB:CVE-2021-21806
HistoryJul 08, 2021 - 12:00 a.m.

CVE-2021-21806

2021-07-0800:00:00
ubuntu.com
ubuntu.com
24
exploitable
use-after-free
vulnerability
webkitgtk
browser
remote code execution
crafted html
web page
ubuntu
javascriptcore engine
v8

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.004

Percentile

72.8%

JSON

An exploitable use-after-free vulnerability exists in WebKitGTK browser
version 2.30.3 x64. A specially crafted HTML web page can cause a
use-after-free condition, resulting in remote code execution. The victim
needs to visit a malicious web site to trigger the vulnerability.

Notes

Author Note
jdstrand webkit receives limited support. For details, see https://wiki.ubuntu.com/SecurityTeam/FAQ#webkit webkit in Ubuntu uses the JavaScriptCore (JSC) engine, not V8
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchwebkit2gtk< 2.30.6-0ubuntu0.18.04.1UNKNOWN
ubuntu20.04noarchwebkit2gtk< 2.30.6-0ubuntu0.20.04.1UNKNOWN
ubuntu20.10noarchwebkit2gtk< 2.30.6-0ubuntu0.20.10.1UNKNOWN
ubuntu21.04noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu21.10noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu22.04noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu22.10noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu23.04noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu23.10noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN
ubuntu24.04noarchwebkit2gtk< 2.32.0-1ubuntu3UNKNOWN

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CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.004

Percentile

72.8%

JSON
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