CVE-2021-30633 Google Chromium Indexed DB API: memory-safety flaw

In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.

Confirmed exploited by CISA on Nov 3, 2021 · US federal patch deadline Nov 17, 2021

What to do

Install Google's security update for Chromium Indexed DB API. If no update exists, follow the vendor's workaround or stop using the product until one ships.
Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
Keep extensions to a minimum and remove ones you do not recognise.
Stop using Internet Explorer and any browser that no longer gets updates.

Who is affected

Could reach you. This one is aimed at devices or apps of the kind people own.

What's at risk: A malicious or hacked website can be enough. Browser bugs are often the first step in a longer attack on the whole computer or phone.

The details

Official name: Google Chromium Indexed DB API Use-After-Free Vulnerability
Product: Google Chromium Indexed DB API
CISA description: 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.
Type of flaw: Memory-safety flaw (CWE-416)
Confirmed exploited: Nov 3, 2021
US federal patch deadline: Nov 17, 2021

NVD record ↗CISA catalog ↗

Ask Cleus about it

Ask about a vulnerability, an update, a weird message, or the news. Plain-word answers, free, no account.

Answering about CVE-2021-30633 ·

Questions about CVE-2021-30633

Is CVE-2021-30633 being exploited?

Yes. CISA added CVE-2021-30633 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks.

How do I fix CVE-2021-30633?

Install Google's security update for Chromium Indexed DB API. If no update exists, follow the vendor's workaround or stop using the product until one ships. Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.

Am I affected by CVE-2021-30633?

Only if you use Google Chromium Indexed DB API. This one is aimed at devices or apps of the kind people own.