CVE-2017-9791
Apache Struts 1 Improper Input Validation Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 10 Feb 2022
- A public exploit reference is listed
Description
The Struts 1 plugin in Apache Struts 2.1.x and 2.3.x might allow remote code execution via a malicious field value passed in a raw message to the ActionMessage.
Key facts
- Published
- 10 Jul 2017
- Last changed
- 21 Oct 2025
- Assigned by
- apache
- KEV added
- 10 Feb 2022
- KEV fix due
- 10 Aug 2022
- EPSS
- 98.908% likely to be exploited in the next 30 days, higher than 99.928% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Struts |
|
Timeline
- 10 Jul 2017 Published
- 10 Feb 2022 CVE-2017-9791 added to CISA KEV
- 10 Feb 2022 Added to the CISA KEV catalogue