{"schemaVersion":3,"id":"USN-6049-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"netty vulnerabilities\n\nIt was discovered that Netty's Zlib decoders did not limit memory\nallocations. A remote attacker could possibly use this issue to cause\nNetty to exhaust memory via malicious input, leading to a denial of\nservice. This issue only affected Ubuntu 16.04 ESM and Ubuntu 20.04 ESM.\n(CVE-2020-11612)\n\nIt was discovered that Netty created temporary files with excessive\npermissions. A local attacker could possibly use this issue to expose\nsensitive information. This issue only affected Ubuntu 16.04 ESM, Ubuntu\n18.04 ESM, and Ubuntu 20.04 ESM. (CVE-2021-21290)\n\nIt was discovered that Netty did not properly validate content-length\nheaders. A remote attacker could possibly use this issue to smuggle\nrequests. This issue was only fixed in Ubuntu 20.04 ESM. (CVE-2021-21295,\nCVE-2021-21409)\n\nIt was discovered that Netty's Bzip2 decompression decoder did not limit\nthe decompressed output data size. A remote attacker could possibly use\nthis issue to cause Netty to exhaust memory via malicious input, leading\nto a denial of service. This issue only affected Ubuntu 18.04 ESM, Ubuntu\n20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-37136)\n\nIt was discovered that Netty's Snappy frame decoder function did not limit\nchunk lengths. A remote attacker could possibly use this issue to cause\nNetty to exhaust memory via malicious input, leading to a denial of\nservice. (CVE-2021-37137)\n\nIt was discovered that Netty did not properly handle control chars at the\nbeginning and end of header names. A remote attacker could possibly use\nthis issue to smuggle requests. This issue only affected Ubuntu 18.04 ESM,\nUbuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2021-43797)\n\nIt was discovered that Netty could be made into an infinite recursion when\nparsing a malformed crafted message. A remote attacker could possibly use\nthis issue to cause Netty to crash, leading to a denial of service. This\nissue only affected Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu 22.10.\n(CVE-2022-41881)\n\nIt was discovered that Netty did not validate header values under certain\ncircumstances. A remote attacker could possibly use this issue to perform\nHTTP response splitting via malicious header values. This issue only\naffected Ubuntu 18.04 ESM, Ubuntu 20.04 ESM, Ubuntu 22.04 LTS, and Ubuntu\n22.10. (CVE-2022-41915)","dates":{"published":"2023-04-28T16:02:26.000Z","modified":"2026-06-25T13:32:01.552Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"netty","name":"netty","label":"netty","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/netty","purlType":"deb","versions":[{"text":"< 1:4.0.34-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:4.1.7-4ubuntu0.1+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:4.1.45-1ubuntu0.1~esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:4.1.48-4+deb11u1build0.22.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:4.0.34-1ubuntu0.1~esm1 | < 1:4.1.7-4ubuntu0.1+esm2 | < 1:4.1.45-1ubuntu0.1~esm1 | < 1:4.1.48-4+deb11u1build0.22.04.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6049-1","label":"ubuntu.com/security/notices/USN-6049-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-11612","label":"ubuntu.com/security/CVE-2020-11612","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-21290","label":"ubuntu.com/security/CVE-2021-21290","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-21295","label":"ubuntu.com/security/CVE-2021-21295","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-21409","label":"ubuntu.com/security/CVE-2021-21409","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-37136","label":"ubuntu.com/security/CVE-2021-37136","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-37137","label":"ubuntu.com/security/CVE-2021-37137","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-43797","label":"ubuntu.com/security/CVE-2021-43797","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2022-41881","label":"ubuntu.com/security/CVE-2022-41881","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2022-41915","label":"ubuntu.com/security/CVE-2022-41915","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-11612","CVE-2021-21290","CVE-2021-21295","CVE-2021-21409","CVE-2021-37136","CVE-2021-37137","CVE-2021-43797","CVE-2022-41881","CVE-2022-41915"],"downstream":[],"duplicates":[],"related":["CVE-2020-11612","CVE-2021-21290","CVE-2021-21295","CVE-2021-21409","CVE-2021-37136","CVE-2021-37137","CVE-2021-43797","CVE-2022-41881","CVE-2022-41915"]},"timeline":[{"kind":"published","date":"2023-04-28T16:02:26.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:01.552Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T10:35:15.754Z","stale":false,"partial":false}}