{"cve":"CVE-2025-55163","nvd":{"published":"2025-08-13T15:15:39.390","modified":"2026-06-17T09:41:23.033","status":"Modified","description":"Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://github.com/netty/netty/security/advisories/GHSA-prj3-ccx8-p6x4","http://www.openwall.com/lists/oss-security/2025/08/16/1","https://www.kb.cert.org/vuls/id/767506"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-19T22:06:45.861874017+00:00"},"epss":{"cve":"CVE-2025-55163","score":0.01101,"percentile":0.65699,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-prj3-ccx8-p6x4","url":"https://osv.dev/vulnerability/GHSA-prj3-ccx8-p6x4","summary":"Netty affected by MadeYouReset HTTP/2 DDoS vulnerability","modified":"2026-09-10T03:50:27.396257754Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","ranges":[">=4.2.0.Alpha1 <4.2.4.Final"],"fixed":["4.2.4.Final"]},{"ecosystem":"Maven","name":"io.netty:netty-codec-http2","purl":"pkg:maven/io.netty/netty-codec-http2","ranges":["<4.1.124.Final"],"fixed":["4.1.124.Final"]},{"ecosystem":"Maven","name":"io.grpc:grpc-netty-shaded","purl":"pkg:maven/io.grpc/grpc-netty-shaded","ranges":["<1.75.0"],"fixed":["1.75.0"]}]}],"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."]}