CVE-2025-66675 is a high-severity (CVSS 8.2) CWE-459 vulnerability in org.apache.struts:struts2-core. A fix is available for org.apache.struts:struts2-core — see the affected versions and patch details below.
Apache Struts: File leak in multipart request processing causes disk exhaustion (DoS) - version ranges fixed
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-66675.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
org.apache.struts:struts2-core☕org.apache.struts:struts2-coreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Denial of Service vulnerability in Apache Struts, file leak in multipart request processing causes disk exhaustion.
This issue affects Apache Struts: from 2.0.0 through 6.7.4, from 7.0.0 through 7.0.3.
Users are recommended to upgrade to version 6.8.0 or 7.1.1, which fixes the issue.
It's related to https://cve.org/CVERecord?id=CVE-2025-64775 - this CVE addresses missing affected version 6.7.4
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apache.struts:struts2-core | ≥ 2.0.0&&< 6.8.0 | 6.8.0org.apache.struts:struts2-core:6.8.0 |
| ☕Maven | org.apache.struts:struts2-core | ≥ 7.0.0&&< 7.1.1 | 7.1.1org.apache.struts:struts2-core:7.1.1 |
Affected Products
strutsapacheDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.struts:struts2-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.struts:struts2-core to 6.8.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-66675 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is CVE-2025-66675 in your dependencies?
Find it across Maven, including transitive dependencies.