{"id":"CVE-2025-25193","aliases":["GHSA-389x-839f-4rhx"],"url":"https://o3.security/vulnerability/CVE-2025-25193","summary":"Denial of Service attack on windows app using Netty","details":"### Summary\nAn unsafe reading of environment file could potentially cause a denial of service in Netty.\nWhen loaded on an Windows application, Netty attemps to load a file that does not exist. If an attacker creates such a large file, the Netty application crash.\n\n### Details\nA similar issue was previously reported in https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv\nThis issue was fixed, but the fix was incomplete in that null-bytes were not counted against the input limit.\n\n\n### PoC\nThe PoC is the same as for https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv with the detail that the file should only contain null-bytes; 0x00.\nWhen the null-bytes are encountered by the `InputStreamReader`, it will issue replacement characters in its charset decoding, which will fill up the line-buffer in the `BufferedReader.readLine()`, because the replacement character is not a line-break character.\n\n### Impact\nImpact is the same as https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv","published":"2025-02-10T22:02:17.197Z","modified":"2026-08-12T15:13:44.141529Z","cvss":{"score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-common","fixedVersion":"4.1.118.Final"}],"fix":{"url":"https://github.com/netty/netty/commit/d1fbda62d3a47835d3fb35db8bd42ecc205a5386","label":"netty/netty@d1fbda6"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/25xxx/CVE-2025-25193.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-389x-839f-4rhx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-25193"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20250221-0006/"},{"type":"FIX","url":"https://github.com/netty/netty/commit/d1fbda62d3a47835d3fb35db8bd42ecc205a5386"},{"type":"PACKAGE","url":"https://github.com/netty/netty"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20250221-0006"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T15:13:44.141529Z"}}