CVE-2021-34484 Microsoft Windows: privilege escalation
In plain words: Something running with limited rights can promote itself to full control. Turns a small foothold (like a malicious app) into administrator or system-level access.
Confirmed exploited by CISA on · US federal patch deadline Apr 21, 2022
What to do
- Install Microsoft's security update for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic updates for the operating system and for Office, PDF and archive apps.
- Be careful with unexpected attachments — documents, .zip/.rar files and shortcuts are common bait.
- Use a normal (non-admin) account day to day and keep built-in protection like Microsoft Defender on.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Your files, saved passwords and accounts. Many of these let a program that is already running gain full administrator control.
The details
- Official name
- Microsoft Windows User Profile Service Privilege Escalation Vulnerability
- Product
- Microsoft Windows
- CISA description
- Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.
- Type of flaw
- Privilege escalation (CWE-269)
- Confirmed exploited
- Mar 31, 2022
- US federal patch deadline
- Apr 21, 2022
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-2021-34484 ·
Questions about CVE-2021-34484
Is CVE-2021-34484 being exploited?
Yes. CISA added CVE-2021-34484 to its Known Exploited Vulnerabilities catalog on Mar 31, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2021-34484?
Install Microsoft's security update for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic updates for the operating system and for Office, PDF and archive apps.
Am I affected by CVE-2021-34484?
Only if you use Microsoft Windows. This one is aimed at devices or apps of the kind people own.