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CVE-2021-37973

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who...

9.6 CriticalIn KEVFix available

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

11.7%Up 10.7 points since Oct 9, 2021
90%50%10%1%

What each source reports

NVD Score used 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-416
Updated
2026-11-02
CVE List 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
EUVDEUVD-2021-24446 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
EUVD-2021-24446
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-w2c8-qc3j-3xr5 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who...

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
GHSA-w2c8-qc3j-3xr5
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
CISA KEV No score

Google Chromium Portals Use-After-Free Vulnerability

Google Chromium Portals contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

Record
CVE-2021-37973
Weakness
CWE-416
Updated
2026-11-02
OSVALPINE-CVE-2021-37973 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
ALPINE-CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-03
Show 9 moreShow less
OSV 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-37973 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
DEBIAN-CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-37973 9.6

Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.

Record
UBUNTU-CVE-2021-37973
CVSS 3.1
9.6 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2022-0050 No score

Updated qtwebengine5 packages fix security vulnerability

The qtwebengine5 package has been updated to version 5.15.8, fixing several security issues in the bundled chromium code. See the referenced package announcement for details.

Record
MGASA-2022-0050
Updated
2026-11-02
OSVopenSUSE-SU-2021:1339-1 No score

Security update for chromium

This update for chromium fixes the following issues:

Chromium 94.0.4606.54 (boo#1190765):

  • CVE-2021-37956: Use after free in Offline use
  • CVE-2021-37957: Use after free in WebGPU
  • CVE-2021-37958: Inappropriate implementation in Navigation
  • CVE-2021-37959: Use after free in Task Manager
  • CVE-2021-37960: Inappropriate implementation in Blink graphics
  • CVE-2021-37961: Use after free in Tab Strip
  • CVE-2021-37962: Use after free in Performance Manager
  • CVE-2021-37963: Side-channel information leakage in DevTools
  • CVE-2021-37964: Inappropriate implementation in ChromeOS Networking
  • CVE-2021-37965: Inappropriate implementation in Background Fetch API
  • CVE-2021-37966: Inappropriate implementation in Compositing
  • CVE-2021-37967: Inappropriate implementation in Background Fetch API
  • CVE-2021-37968: Inappropriate implementation in Background Fetch API
  • CVE-2021-37969: Inappropriate implementation in Google Updater
  • CVE-2021-37970: Use after free in File System API
  • CVE-2021-37971: Incorrect security UI in Web Browser UI
  • CVE-2021-37972: Out of bounds read in libjpeg-turbo

Chromium 94.0.4606.61 (boo#1191166):

  • CVE-2021-37973: Use after free in Portals

Chromium 94.0.4606.71 (boo#1191204):

  • CVE-2021-37974 : Use after free in Safe Browsing
  • CVE-2021-37975 : Use after free in V8
  • CVE-2021-37976 : Information leak in core
Record
openSUSE-SU-2021:1339-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:1350-1 No score

Security update for chromium

This update for chromium fixes the following issues:

Chromium 94.0.4606.81 (boo#1191463):

  • CVE-2021-37977: Use after free in Garbage Collection
  • CVE-2021-37978: Heap buffer overflow in Blink
  • CVE-2021-37979: Heap buffer overflow in WebRTC
  • CVE-2021-37980: Inappropriate implementation in Sandbox

Chromium 94.0.4606.54 (boo#1190765):

  • CVE-2021-37956: Use after free in Offline use
  • CVE-2021-37957: Use after free in WebGPU
  • CVE-2021-37958: Inappropriate implementation in Navigation
  • CVE-2021-37959: Use after free in Task Manager
  • CVE-2021-37960: Inappropriate implementation in Blink graphics
  • CVE-2021-37961: Use after free in Tab Strip
  • CVE-2021-37962: Use after free in Performance Manager
  • CVE-2021-37963: Side-channel information leakage in DevTools
  • CVE-2021-37964: Inappropriate implementation in ChromeOS Networking
  • CVE-2021-37965: Inappropriate implementation in Background Fetch API
  • CVE-2021-37966: Inappropriate implementation in Compositing
  • CVE-2021-37967: Inappropriate implementation in Background Fetch API
  • CVE-2021-37968: Inappropriate implementation in Background Fetch API
  • CVE-2021-37969: Inappropriate implementation in Google Updater
  • CVE-2021-37970: Use after free in File System API
  • CVE-2021-37971: Incorrect security UI in Web Browser UI
  • CVE-2021-37972: Out of bounds read in libjpeg-turbo

Chromium 94.0.4606.61 (boo#1191166):

  • CVE-2021-37973: Use after free in Portals

Chromium 94.0.4606.71 (boo#1191204):

  • CVE-2021-37974 : Use after free in Safe Browsing
  • CVE-2021-37975 : Use after free in V8
  • CVE-2021-37976 : Information leak in core
Record
openSUSE-SU-2021:1350-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11555-1 No score

chromedriver-94.0.4606.71-1.1 on GA media

These are all security issues fixed in the chromedriver-94.0.4606.71-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11555-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11605-1 No score

libQt5Pdf5-5.15.7-1.1 on GA media

These are all security issues fixed in the libQt5Pdf5-5.15.7-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11605-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:12948-1 No score

ungoogled-chromium-113.0.5672.92-1.1 on GA media

These are all security issues fixed in the ungoogled-chromium-113.0.5672.92-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:12948-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
qt5-qtwebengine
Alpine:v3.14
 before 5.15.3_git20211006-r1
5.15.3_git20211006-r1
qt5-qtwebengine
Alpine:v3.15
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.16
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.17
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.18
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.19
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.20
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.21
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.22
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
qt5-qtwebengine
Alpine:v3.23
 before 5.15.3_git20211006-r3
5.15.3_git20211006-r3
Show 11 moreShow less
Affected packages
PackageAffectedFixed
chromium
Debian:12
 before 97.0.4692.71-0.1
97.0.4692.71-0.1
chromium
Debian:13
 before 97.0.4692.71-0.1
97.0.4692.71-0.1
chromium
Debian:14
 before 97.0.4692.71-0.1
97.0.4692.71-0.1
chromium
Debian:11
From an advisory covering 123 CVEs
 before 97.0.4692.71-0.1~deb11u1, plus listed versions
90.0.4430.212-193.0.4577.82-1
97.0.4692.71-0.1~deb11u1
qtwebengine5
Mageia:8
From an advisory covering 51 CVEs
 before 5.15.8-1.mga8
5.15.8-1.mga8
chromium-browser
Ubuntu:18.04:LTS
 before 94.0.4606.71-0ubuntu0.18.04.1, plus listed versions
61.0.3163.100-0ubuntu1.137862.0.3202.62-0ubuntu0.17.10.138062.0.3202.89-0ubuntu1.138662.0.3202.94-0ubuntu1.138863.0.3239.84-0ubuntu1
Show 45 moreShow less
63.0.3239.108-0ubuntu164.0.3282.119-0ubuntu164.0.3282.140-0ubuntu164.0.3282.167-0ubuntu165.0.3325.146-0ubuntu165.0.3325.181-0ubuntu166.0.3359.139-0ubuntu0.18.04.366.0.3359.181-0ubuntu0.18.04.167.0.3396.99-0ubuntu0.18.04.168.0.3440.75-0ubuntu0.18.04.168.0.3440.106-0ubuntu0.18.04.169.0.3497.81-0ubuntu0.18.04.170.0.3538.67-0ubuntu0.18.04.170.0.3538.77-0ubuntu0.18.04.170.0.3538.110-0ubuntu0.18.04.171.0.3578.80-0ubuntu0.18.04.171.0.3578.98-0ubuntu0.18.04.172.0.3626.119-0ubuntu0.18.04.172.0.3626.121-0ubuntu0.18.04.173.0.3683.75-0ubuntu0.18.04.173.0.3683.86-0ubuntu0.18.04.174.0.3729.169-0ubuntu0.18.04.175.0.3770.90-0ubuntu0.18.04.175.0.3770.142-0ubuntu0.18.04.176.0.3809.87-0ubuntu0.18.04.176.0.3809.100-0ubuntu0.18.04.177.0.3865.90-0ubuntu0.18.04.178.0.3904.70-0ubuntu0.18.04.278.0.3904.97-0ubuntu0.18.04.178.0.3904.108-0ubuntu0.18.04.179.0.3945.79-0ubuntu0.18.04.179.0.3945.130-0ubuntu0.18.04.180.0.3987.87-0ubuntu0.18.04.180.0.3987.149-0ubuntu0.18.04.180.0.3987.163-0ubuntu0.18.04.181.0.4044.122-0ubuntu0.18.04.181.0.4044.138-0ubuntu0.18.04.183.0.4103.61-0ubuntu0.18.04.184.0.4147.105-0ubuntu0.18.04.185.0.4183.83-0ubuntu0.18.04.285.0.4183.121-0ubuntu0.18.04.186.0.4240.75-0ubuntu0.18.04.186.0.4240.198-0ubuntu0.18.04.187.0.4280.66-0ubuntu0.18.04.189.0.4389.82-0ubuntu0.18.04.1
94.0.4606.71-0ubuntu0.18.04.1
chromium
SUSE:Package Hub 15 SP3
From an advisory covering 21 CVEs
 before 94.0.4606.71-bp153.2.31.1
94.0.4606.71-bp153.2.31.1
chromium
openSUSE:Leap 15.3
From an advisory covering 21 CVEs
 before 94.0.4606.71-bp153.2.31.1
94.0.4606.71-bp153.2.31.1
chromium
openSUSE:Leap 15.2
From an advisory covering 25 CVEs
 before 94.0.4606.81-lp152.2.132.1
94.0.4606.81-lp152.2.132.1
chromium
openSUSE:Tumbleweed
From an advisory covering 21 CVEs
 before 94.0.4606.71-1.1
94.0.4606.71-1.1
chromium
openSUSE:Tumbleweed
From an advisory covering 2310 CVEs
 before 113.0.5672.92-1.1
113.0.5672.92-1.1

History

History
RecordedChangedSources
affected
exploitation
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, CISA KEV, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-37973 is a critical vulnerability (CVSS 9.6) in Google Chrome, published October 8, 2021. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 11.7%, the 96th percentile. Fixed in qt5-qtwebengine 5.15.3_git20211006-r1.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 7 versions and 2,134 references. The JSON record has them.

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