How severe is CVE-2017-9791?

CVE-2017-9791 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9791 being actively exploited?

Yes. CVE-2017-9791 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-9791?

CVE-2017-9791 primarily affects Apache Struts. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-9791?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2017-9791 have an EU (EUVD) identifier?

Yes. CVE-2017-9791 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-1954. It is also flagged as exploited in the EUVD (since 2022-02-10).

When was CVE-2017-9791 published?

CVE-2017-9791 was published on 2017-07-10 and last updated on 2026-06-17.

CVE-2017-9791

CVE-2017-9791 is a critical-severity vulnerability in Apache Struts with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-02-10). The underlying weakness is classified as CWE-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 99% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-02-10)
EU (EUVD) id: EUVD-2022-1954
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-02-10)
Weakness: CWE-20
Affected product: Apache Struts
Published: 2017-07-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2017-9791?: 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.
How severe is CVE-2017-9791?: CVE-2017-9791 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9791 being actively exploited?: Yes. CVE-2017-9791 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-9791?: CVE-2017-9791 primarily affects Apache Struts. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-9791?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2017-9791 have an EU (EUVD) identifier?: Yes. CVE-2017-9791 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-1954. It is also flagged as exploited in the EUVD (since 2022-02-10).
When was CVE-2017-9791 published?: CVE-2017-9791 was published on 2017-07-10 and last updated on 2026-06-17.

References

Affected products (33)

cpe:2.3:a:apache:struts:2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.4.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.7:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.8:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.12:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.14:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.14.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.14.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.14.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.15:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.15.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.15.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.15.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.16:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.16.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.16.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.16.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.20:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.20.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.20.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.24:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.24.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.24.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.28:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.28.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.29:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.30:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.31:*:*:*:*:*:*:*
cpe:2.3:a:apache:struts:2.3.32:*:*:*:*:*:*:*

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