CVE-2012-0391 Apache Struts 2: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline Jul 21, 2022
What to do
- Install Apache's security update for Struts 2. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Apache Struts 2 Improper Input Validation Vulnerability
- Product
- Apache Struts 2
- CISA description
- The ExceptionDelegator component in Apache Struts 2 before 2.2.3.1 contains an improper input validation vulnerability that allows for remote code execution.
- Type of flaw
- Software flaw (CWE-20)
- Confirmed exploited
- Jan 21, 2022
- US federal patch deadline
- Jul 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-2012-0391 ·
Questions about CVE-2012-0391
Is CVE-2012-0391 being exploited?
Yes. CISA added CVE-2012-0391 to its Known Exploited Vulnerabilities catalog on Jan 21, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2012-0391?
Install Apache's security update for Struts 2. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2012-0391?
Only if you use Apache Struts 2. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.