CVE-2021-30661

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.045 · 91 %ileEURUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV
Likely / severe?
4.49% (91st) EPSS
CVSS 6.8 · medium
Is it mine?
1,281 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

added 2021-11-03remediate by 2021-11-17

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

Apple Multiple Products WebKit Storage Use-After-Free Vulnerability

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedwebkit2gtk3-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-0:2.30.4-1.el8.src as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debuginfo-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debuginfo-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debuginfo-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debuginfo-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debuginfo-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debugsource-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debugsource-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debugsource-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debugsource-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-debugsource-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-debuginfo-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-debuginfo-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-debuginfo-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-debuginfo-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-devel-debuginfo-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-debuginfo-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-debuginfo-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-debuginfo-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-debuginfo-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-debuginfo-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-debuginfo-0:2.30.4-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-debuginfo-0:2.30.4-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-debuginfo-0:2.30.4-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-debuginfo-0:2.30.4-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
  • Fixedwebkit2gtk3-jsc-devel-debuginfo-0:2.30.4-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 GDM must be restarted for this update to take effect.

    https://access.redhat.com/errata/RHSA-2021:1586
02

cvss

Technical severity, 0–10. One row per scoring source.

8.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9
v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondaryexploitability 2.8 · impact 5.9
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Red Hat Product Security US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USprimaryCWE-20USCWE-416US
05

affected products (1,281)

Products and version ranges known to be affected.

showing 20 of 1,281
06

advisories (1)

Vendor and ecosystem advisories describing this.

  • RHSA-2021:1586Red Hat Security Advisory: GNOME security, bug fix, and enhancement update2021-05-18csaf · redhat_csafUS

    An update for GNOME is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

07

also known as (5)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdredhat_csafNVDCVE.orgMITRE
published 2021-09-08modified 2026-06-17
10

references (33)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan