No exploitation reportedFix available

CVE-2017-9804

Q: Is CVE-2017-9804 actively exploited?

Active exploitation of CVE-2017-9804 has not been confirmed. Its EPSS score was 8.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2017-9804?

CVE-2017-9804 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2017-09-20
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Apache Struts 2.3.7 through 2.3.33 and 2.5 through 2.5.12, if an application allows entering a URL in a form field and built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL. NOTE: this vulnerability exists because of an incomplete fix for S2-047 / CVE-2017-7672.

Timeline

dates in UTC

2017-09-2017:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9804?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9804?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apache struts

Branch	Affected	Fixed in	Source
2.3	= 2.3.7	no fix published	NVD
2.3	= 2.3.8	no fix published	NVD
2.3	= 2.3.9	no fix published	NVD
2.3	= 2.3.10	no fix published	NVD
2.3	= 2.3.11	no fix published	NVD
2.3	= 2.3.12	no fix published	NVD
2.3	= 2.3.13	no fix published	NVD
2.3	= 2.3.14	no fix published	NVD
2.3	= 2.3.14.1	no fix published	NVD
2.3	= 2.3.14.2	no fix published	NVD
2.3	= 2.3.14.3	no fix published	NVD
2.3	= 2.3.15	no fix published	NVD

struts2-core

Branch	Affected	Fixed in	Source
2.5	≥ 2.5.0, < 2.5.13	2.5.13	OSV
2.3	≥ 2.3.7, < 2.3.34	2.3.34	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.oracle.comPatch
struts.apache.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score8.2 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-09-20
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-9804?

Is CVE-2017-9804 actively exploited?

Active exploitation of CVE-2017-9804 has not been confirmed. Its EPSS score was 8.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-9804?

CVE-2017-9804 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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