How severe is CVE-2017-9791?

CVE-2017-9791 has a CVSS 3.1 base score of 9.8 (CRITICAL). EPSS estimates a 98.9% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2017-9791: Apache Struts 1 Improper Input Validation Vulnerability

CISA Known Exploited Vulnerabilities

Apache Struts 1 Improper Input Validation Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-02-10

Remediation due

2022-08-10

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2017-9791

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.

Severity

CVSS 3.1 · CISA9.8 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impacttotal

Exploitation Context

as of October 14, 2026

All KEV statistics→

CISA added CVE-2017-9791 to the KEV catalog 1,676 days after its CVE record was published.
It is one of 41 Apache entries in the CISA KEV catalog, and one of 13 added in 2022.
Its current EPSS score (98.9%) is higher than that of 86% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Apache Software Foundation	Apache Software Foundation Apache Struts	2.1.x series 2.3.x series

References

7 Links

Exploits & PoCs

Vulnerability databases

Other references

Record Details

Published

2017-07-10

Last updated

2025-10-21

Assigner (CNA)

apache

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.