{"id":"CVE-2025-6703","aliases":["EUVD-2025-28762","GHSA-jfv6-x22w-grhf"],"status":"published","title":"transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint","description":"Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.","severity":{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00248,"percentile":0.16201,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2025-06-26T09:30:03Z","modified":"2026-10-28T02:30:55Z","products":[{"vendor":"mozilla","product":"neqo"}],"references":[{"url":"https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf","tags":["Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/6xxx/CVE-2025-6703.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6703","tags":["advisory"]},{"url":"https://github.com/mozilla/neqo","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-6703","title":"transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint","description":"Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.","status":"published","published":"2025-06-26T09:30:03.893Z","modified":"2025-06-26T12:59:56.348Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear","level":"low","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:40.419293Z"}],"euvd":[{"id":"EUVD-2025-28762","description":"Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.","status":"published","published":"2025-06-26T09:30:03Z","modified":"2025-06-26T12:59:56Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear","level":"low"}],"updated_at":"2026-11-02T20:32:16.561416Z"}],"nvd":[{"id":"CVE-2025-6703","description":"Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.","status":"published","published":"2025-06-26T10:15:25.95Z","modified":"2026-06-17T10:02:25.02Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:L/U:Clear","level":"low","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:11:14.781314Z"}],"osv":[{"id":"CVE-2025-6703","title":"transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint","description":"Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.","status":"published","published":"2025-06-26T09:30:03.893Z","modified":"2026-10-28T02:30:55.33455546Z","cvss":[{"version":"4.0","score":2.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear","level":"low"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:44:52.202386Z"}]}}