{"cve":"CVE-2020-13697","nvd":{"published":"2021-02-23T08:15:11.307","modified":"2026-06-17T02:53:34.670","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/NanoHttpd/nanohttpd","https://www.vdoo.com/advisories","https://github.com/NanoHttpd/nanohttpd","https://www.vdoo.com/advisories"],"products":["nanohttpd:nanohttpd"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2020-13697","score":0.00758,"percentile":0.55213,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pr5m-4w22-8483","url":"https://osv.dev/vulnerability/GHSA-pr5m-4w22-8483","summary":"NanoHTTPD Cross-site Scripting vulnerability","modified":"2024-12-01T05:47:55.910898Z","packages":[{"ecosystem":"Maven","name":"org.nanohttpd:nanohttpd-nanolets","purl":"pkg:maven/org.nanohttpd/nanohttpd-nanolets","ranges":["<=2.3.1"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}