What’s Vulnerable › Vulnerabilities

CVE-2020-13697

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-23 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in RouterNanoHTTPD.java in NanoHTTPD through 2.3.1. The GeneralHandler class implements a basic GET handler that prints debug information as an HTML page. Any web server that extends this class without implementing its own GET handler is vulnerable to reflected XSS, because the GeneralHandler GET handler prints user input passed through the query string without any sanitization.

Affected products

• org.nanohttpd:nanohttpd: through 2.3.1

References

• https://github.com/NanoHttpd/nanohttpd
• https://www.vdoo.com/advisories
• https://github.com/NanoHttpd/nanohttpd
• https://www.vdoo.com/advisories

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