Is CVE-2017-9791 in the CISA KEV catalog?

Yes. CVE-2017-9791 is on the CISA Known Exploited Vulnerabilities list, added 2022-02-10.

What is the CVSS severity of CVE-2017-9791?

CVE-2017-9791 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-9791?

CVE-2017-9791 has an EPSS score of 98.93% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2017-9791?

No published fix for CVE-2017-9791 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-08-10. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2017-9791

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-20Improper Input Validation

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-08-10

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

98.93%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Apache Struts 1 Improper Input Validation Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2022-08-10

References

Patch1

oracle.com

Vendor Advisory1

struts.apache.org

Third-Party Advisory5

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.