CVE-2021-30633

9.6 CRITICAL 33% exploit odds Drop everything exploited in the wild No fix listed Memory safety Browser & mail

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2021-04-13 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-10-08 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2021-11-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2021-11-17 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 03:50 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 33.2% in the next 30 days (EPSS).
Severity: 9.6 CRITICAL (CVSS).
Fix: none linked yet, which raises it.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2021-10-08 21:15 UTC
Last modified: 2026-06-17 03:50 UTC
Added to CISA KEV: 2021-11-03
Exploit probability: 33.2% · EPSS, next 30 days
Weakness: CWE-416 · Use after free
Record status: Analyzed

Affected

Google Chrome < 93.0.4577.82
Fedoraproject Fedora 33
Fedoraproject Fedora 35

Attack profile CVSS 3.1 · 9.6

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-30633.md and follow it. Check whether this project is affected by CVE-2021-30633. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record