---
id: "CVE-2020-17530"
kind: "vulnerability"
aliases: ["CVE-2020-17530"]
title: "Apache Struts: Apache Struts Remote Code Execution Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.95931
exploited: true
status: "open"
category: "package"
products: [{"name": "Apache Struts", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apache-struts", "exploited", "java", "package"]
not_affected_if: ["default-config", "not-using-struts"]
published_at: "2020-12-11T02:15:10+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-17530", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-17530", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-17530", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Apache Struts: Apache Struts Remote Code Execution Vulnerability

Apache Struts evaluates raw user input as OGNL expressions inside tag attributes, so attacker-supplied input can execute code. CISA lists this CVE as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Apache Struts affected ? fixed ?

## Fix

Apply the Apache Struts update per vendor instructions; the fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-17530
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-17530
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-17530

## From the sources

Forced Object-Graph Navigation Language (OGNL) evaluation in Apache Struts, when evaluated on raw user input in tag attributes, can lead to remote code execution.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_