Vulnerability Database

413,619

Total vulnerabilities in the database

CVE-2009-5135 — nextapp / echo

Improper Input Validation

The Java XML parser in Echo before 2.1.1 and 3.x before 3.0.b6 allows remote attackers to read arbitrary files via a request containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.

  • Published: May 2, 2013
  • Updated: Nov 8, 2026
  • CVE: CVE-2009-5135
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:P/I:N/A:N

CWEs:

Software Affected versions
nextapp / echo <= 2.1.0
nextapp / echo = 2.0-alpha1
nextapp / echo = 2.0-alpha10
nextapp / echo = 2.0-alpha11
nextapp / echo = 2.0-alpha12
nextapp / echo = 2.0-alpha13
nextapp / echo = 2.0-alpha14
nextapp / echo = 2.0-alpha15
nextapp / echo = 2.0-alpha16
nextapp / echo = 2.0-alpha2
nextapp / echo = 2.0-alpha3
nextapp / echo = 2.0-alpha4
nextapp / echo = 2.0-alpha5
nextapp / echo = 2.0-alpha6
nextapp / echo = 2.0-alpha7
nextapp / echo = 2.0-alpha8
nextapp / echo = 2.0-alpha9
nextapp / echo = 2.0-beta1
nextapp / echo = 2.0-beta2
nextapp / echo = 2.0-beta3
nextapp / echo = 2.0-beta4
nextapp / echo = 2.0-rc1
nextapp / echo = 2.0-rc2
nextapp / echo = 2.0-rc3
nextapp / echo = 2.0-rc4
nextapp / echo = 2.0-rc5
nextapp / echo = 2.0-rc6
nextapp / echo = 2.0-rc7
nextapp / echo = 2.0.1-test1
nextapp / echo = 2.0.1-test2
nextapp / echo = 2.0.1-test3
nextapp / echo = 2.1.0-beta1
nextapp / echo = 2.1.0-beta2
nextapp / echo = 2.1.0-beta3
nextapp / echo = 2.1.0-beta4
nextapp / echo = 2.1.0-beta5
nextapp / echo = 2.1.0-rc1
nextapp / echo = 2.1.0-rc2
nextapp / echo = 2.1.0-rc3
nextapp / echo = 2.1.0-rc4
nextapp / echo = 3.0-beta1
nextapp / echo = 3.0-beta2
nextapp / echo = 3.0-beta3
nextapp / echo = 3.0-beta4
nextapp / echo = 3.0-beta5

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Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.