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CVE-2021-21203

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to...

8.8 HighFix available

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption 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

1.77%Up 1.0 points since Apr 27, 2021
90%50%10%1%

What each source reports

NVD Score used 8.8

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
CVE-2021-21203
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 No score

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
CVE-2021-21203
Updated
2026-11-02
EUVDEUVD-2021-8594 No score

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
EUVD-2021-8594
Updated
2026-11-03
GitHub AdvisoriesGHSA-mc92-h7wq-gg5c No score

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to...

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
GHSA-mc92-h7wq-gg5c
Weakness
CWE-416
Updated
2026-11-02
OSVALPINE-CVE-2021-21203 8.8

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
ALPINE-CVE-2021-21203
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSV 8.8

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
CVE-2021-21203
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 5 moreShow less
OSVDEBIAN-CVE-2021-21203 8.8

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
DEBIAN-CVE-2021-21203
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-21203 8.8

Use after free in Blink in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Record
UBUNTU-CVE-2021-21203
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2021:0629-1 No score

Security update for Chromium

This update for chromium fixes the following issues:

  • Chromium was updated to 90.0.4430.93 (boo#1184764,boo#1185047,boo#1185398)
    • CVE-2021-21227: Insufficient data validation in V8.
    • CVE-2021-21232: Use after free in Dev Tools.
    • CVE-2021-21233: Heap buffer overflow in ANGLE.
    • CVE-2021-21228: Insufficient policy enforcement in extensions.
    • CVE-2021-21229: Incorrect security UI in downloads.
    • CVE-2021-21230: Type Confusion in V8.
    • CVE-2021-21231: Insufficient data validation in V8.
    • CVE-2021-21222: Heap buffer overflow in V8
    • CVE-2021-21223: Integer overflow in Mojo
    • CVE-2021-21224: Type Confusion in V8
    • CVE-2021-21225: Out of bounds memory access in V8
    • CVE-2021-21226: Use after free in navigation
    • CVE-2021-21201: Use after free in permissions
    • CVE-2021-21202: Use after free in extensions
    • CVE-2021-21203: Use after free in Blink
    • CVE-2021-21204: Use after free in Blink
    • CVE-2021-21205: Insufficient policy enforcement in navigation
    • CVE-2021-21221: Insufficient validation of untrusted input in Mojo
    • CVE-2021-21207: Use after free in IndexedDB
    • CVE-2021-21208: Insufficient data validation in QR scanner
    • CVE-2021-21209: Inappropriate implementation in storage
    • CVE-2021-21210: Inappropriate implementation in Network
    • CVE-2021-21211: Inappropriate implementation in Navigatio
    • CVE-2021-21212: Incorrect security UI in Network Config UI
    • CVE-2021-21213: Use after free in WebMIDI
Record
openSUSE-SU-2021:0629-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10681-1 No score

chromedriver-93.0.4577.82-1.1 on GA media

These are all security issues fixed in the chromedriver-93.0.4577.82-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10681-1
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
chromium
Alpine:v3.14
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.15
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.16
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.17
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.18
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.19
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.20
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.21
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.22
 before 90.0.4430.72-r0
90.0.4430.72-r0
chromium
Alpine:v3.23
 before 90.0.4430.72-r0
90.0.4430.72-r0
Show 20 moreShow less
Affected packages
PackageAffectedFixed
chromium
Alpine:v3.24
 before 90.0.4430.72-r0
90.0.4430.72-r0
qt5-qtwebengine
Alpine:v3.14
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.15
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.16
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.17
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.18
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.19
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.20
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.21
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.22
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
qt5-qtwebengine
Alpine:v3.23
 before 5.15.3_git20210510-r0
5.15.3_git20210510-r0
chromium
Debian:12
 before 90.0.4430.72-1
90.0.4430.72-1
chromium
Debian:13
 before 90.0.4430.72-1
90.0.4430.72-1
chromium
Debian:14
 before 90.0.4430.72-1
90.0.4430.72-1
chromium
Debian:10
From an advisory covering 25 CVEs
 before 90.0.4430.85-1~deb10u1, plus listed versions
73.0.3683.75-174.0.3729.108-175.0.3770.10-175.0.3770.80-175.0.3770.90-1
Show 45 moreShow less
76.0.3809.100-176.0.3809.100-1~deb10u176.0.3809.62-176.0.3809.71-176.0.3809.87-176.0.3809.87-278.0.3904.108-178.0.3904.108-1~deb10u178.0.3904.87-178.0.3904.97-178.0.3904.97-1~deb10u179.0.3945.130-179.0.3945.130-1~deb10u179.0.3945.130-279.0.3945.56-179.0.3945.79-180.0.3987.106-180.0.3987.116-180.0.3987.122-180.0.3987.122-280.0.3987.132-180.0.3987.132-1~deb10u180.0.3987.149-180.0.3987.149-1~deb10u180.0.3987.162-180.0.3987.162-1~deb10u181.0.4044.62-181.0.4044.92-183.0.4103.106-183.0.4103.116-183.0.4103.116-1~deb10u183.0.4103.116-1~deb10u283.0.4103.116-1~deb10u383.0.4103.116-283.0.4103.116-383.0.4103.116-3.183.0.4103.83-184.0.4147.105-184.0.4147.89-187.0.4280.141-0.187.0.4280.141-0.1~deb10u187.0.4280.88-0.187.0.4280.88-0.287.0.4280.88-0.387.0.4280.88-0.4
90.0.4430.85-1~deb10u1
chromium-browser
Ubuntu:16.04:LTS
 before 90.0.4430.72-0ubuntu0.16.04.1, plus listed versions
45.0.2454.101-0ubuntu1.120147.0.2526.73-0ubuntu1.121847.0.2526.106-0ubuntu1.122148.0.2564.82-0ubuntu1.122248.0.2564.116-0ubuntu1.1229
Show 45 moreShow less
49.0.2623.87-0ubuntu1.123249.0.2623.108-0ubuntu1.123350.0.2661.102-0ubuntu0.16.04.1.123751.0.2704.79-0ubuntu0.16.04.1.124252.0.2743.116-0ubuntu0.16.04.1.125053.0.2785.143-0ubuntu0.16.04.1.125453.0.2785.143-0ubuntu0.16.04.1.125755.0.2883.87-0ubuntu0.16.04.126356.0.2924.76-0ubuntu0.16.04.126857.0.2987.98-0ubuntu0.16.04.127658.0.3029.81-0ubuntu0.16.04.127758.0.3029.96-0ubuntu0.16.04.127958.0.3029.110-0ubuntu0.16.04.128159.0.3071.109-0ubuntu0.16.04.128959.0.3071.109-0ubuntu0.16.04.129160.0.3112.78-0ubuntu0.16.04.129360.0.3112.113-0ubuntu0.16.04.129861.0.3163.79-0ubuntu0.16.04.130061.0.3163.100-0ubuntu0.16.04.130662.0.3202.62-0ubuntu0.16.04.130862.0.3202.75-0ubuntu0.16.04.131362.0.3202.89-0ubuntu0.16.04.131562.0.3202.94-0ubuntu0.16.04.131763.0.3239.84-0ubuntu0.16.04.163.0.3239.132-0ubuntu0.16.04.164.0.3282.119-0ubuntu0.16.04.164.0.3282.140-0ubuntu0.16.04.164.0.3282.167-0ubuntu0.16.04.165.0.3325.181-0ubuntu0.16.04.166.0.3359.139-0ubuntu0.16.04.366.0.3359.181-0ubuntu0.16.04.167.0.3396.99-0ubuntu0.16.04.268.0.3440.75-0ubuntu0.16.04.168.0.3440.106-0ubuntu0.16.04.169.0.3497.81-0ubuntu0.16.04.170.0.3538.67-0ubuntu0.16.04.170.0.3538.77-0ubuntu0.16.04.170.0.3538.110-0ubuntu0.16.04.171.0.3578.80-0ubuntu0.16.04.171.0.3578.98-0ubuntu0.16.04.172.0.3626.119-0ubuntu0.16.04.172.0.3626.121-0ubuntu0.16.04.173.0.3683.75-0ubuntu0.16.04.173.0.3683.86-0ubuntu0.16.04.174.0.3729.169-0ubuntu0.16.04.1
90.0.4430.72-0ubuntu0.16.04.1
chromium-browser
Ubuntu:18.04:LTS
 before 90.0.4430.72-0ubuntu0.18.04.1, 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
90.0.4430.72-0ubuntu0.18.04.1
chromium
openSUSE:Leap 15.2
From an advisory covering 25 CVEs
 before 90.0.4430.93-lp152.2.89.1
90.0.4430.93-lp152.2.89.1
chromium
openSUSE:Tumbleweed
From an advisory covering 1081 CVEs
 before 93.0.4577.82-1.1
93.0.4577.82-1.1
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, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-21203 is a high vulnerability (CVSS 8.8) in Google Chrome, published April 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.77%, the 78th percentile. Fixed in chromium 90.0.4430.72-r0.

References

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This page doesn't list everything

Left out here: 36 versions and 2,130 references. The JSON record has them.

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