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CVE-2021-30633

Google Chromium Indexed DB API Use-After-Free

9.6 CRITICALActively exploited (CISA KEV)EPSS 33.2%
  1. Published8 Oct 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

Google Chromium Indexed DB API 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 could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Google Chrome< 93.0.4577.82
Fedoraproject Fedora33 · 35

Remediation

Fixed in
Google Chrome≥ 93.0.4577.82

References

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Frequently asked

Is CVE-2021-30633 being actively exploited?

Yes. CVE-2021-30633 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2021-30633?

CVE-2021-30633 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 33.2% probability of exploitation.

Which products are affected by CVE-2021-30633?

Affected products include Google Chrome, Fedoraproject Fedora.

How do I fix CVE-2021-30633?

Upgrade affected software to a fixed version, for example Google Chrome 93.0.4577.82 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-30633 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.