CVE-2017-9791 Apache Struts 1: 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 Aug 10, 2022
What to do
- Install Apache's security update for Struts 1. 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 1 Improper Input Validation Vulnerability
- Product
- Apache Struts 1
- CISA description
- The Struts 1 plugin in Apache Struts might allow remote code execution via a malicious field value passed in a raw message to the ActionMessage.
- Type of flaw
- Software flaw (CWE-20)
- Confirmed exploited
- Feb 10, 2022
- US federal patch deadline
- Aug 10, 2022
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Answering about CVE-2017-9791 ·
Questions about CVE-2017-9791
Is CVE-2017-9791 being exploited?
Yes. CISA added CVE-2017-9791 to its Known Exploited Vulnerabilities catalog on Feb 10, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2017-9791?
Install Apache's security update for Struts 1. 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-2017-9791?
Only if you use Apache Struts 1. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.