CVE-2021-30633
CriticalExploitedPublic exploitUse after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.
Published Dec 15, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-30633, UBUNTU-CVE-2021-30633
Key Facts
Patch immediately- CVE-2021-30633 is a critical-severity vulnerability (CVSS 9.6 v3.1) affecting Chrome (Google), Fedora (Fedoraproject), chromium (arch) and 19 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 8, 2021. Public exploit code is available.
- EPSS estimates a 33% probability of exploitation in the next 30 days.
- Fixed versions are available, including Chrome 93.0.4577.82, chromedriver 93.0.4577.82-1.1, chromedriver 93.0.4577.82-bp153.2.28.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
33%
Higher than 98.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-30633 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Use after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Sep 8, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
69 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ChromeGoogle | >= unspecified | 93.0.4577.82 |
| FedoraFedoraproject | 33, 35 | n/a |
| chromiumarch | See advisory | 93.0.4577.82-1 |
| operaarch | See advisory | 79.0.4143.50-1 |
| vivaldiarch | See advisory | 4.2.2406.44-1 |
Patched Releases
Chrome
93.0.4577.82
chromedriver
93.0.4577.82-1.1, 93.0.4577.82-bp153.2.28.1, 93.0.4577.82-lp152.2.125.1
chromium
93.0.4577.82-1, 93.0.4577.82-1.1, 93.0.4577.82-bp153.2.28.1, 93.0.4577.82-lp152.2.125.1, 93.0.4577.82-r0
chromium-browser
94.0.4606.71-0ubuntu0.18.04.1
libqt5-qtpdf-devel
5.15.7-1.1
libqt5-qtpdf-examples
5.15.7-1.1
libqt5-qtpdf-imports
5.15.7-1.1
libqt5-qtpdf-private-headers-devel
5.15.7-1.1
libqt5-qtwebengine
5.15.7-1.1
libqt5-qtwebengine-devel
5.15.7-1.1
libqt5-qtwebengine-examples
5.15.7-1.1
libqt5-qtwebengine-private-headers-devel
5.15.7-1.1
libQt5Pdf5
5.15.7-1.1
libQt5PdfWidgets5
5.15.7-1.1
nodejs-electron
13.5.0-1.1, 16.0.9-bp153.2.1
nodejs-electron-devel
16.0.9-bp153.2.1
opera
79.0.4143.50-1, 79.0.4143.50-lp153.2.21.1, 85.0.4341.28-lp154.2.5.1
qt5-qtwebengine
5.15.3_git20211006-r0
ungoogled-chromium
113.0.5672.92-1.1
ungoogled-chromium-chromedriver
113.0.5672.92-1.1
vivaldi
4.2.2406.44-1
Timeline
Added to Industry KEV feed
Sep 8, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
Dec 15, 2021
Last updated
Aug 4, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisoryhttps://bugzilla.suse.com/1027519
- advisoryhttps://bugzilla.suse.com/1185376
- advisoryhttps://bugzilla.suse.com/1187416
- advisoryhttps://bugzilla.suse.com/1189632
- advisoryhttps://chromereleases.googleblog.com/2021/12/stable-channel-update-for-desktop_13.html
FAQ
Common Questions.
Use after free in Indexed DB API in Google Chrome prior to 93.0.4577.82 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.
Affected: Chrome (Google) versions >= unspecified; Fedora (Fedoraproject) versions 33, 35; chromium (arch), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 8, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Chrome 93.0.4577.82, chromedriver 93.0.4577.82-1.1, chromedriver 93.0.4577.82-bp153.2.28.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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