{"id":"CVE-2021-36159","details":"libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\\0' terminator one byte too late.","modified":"2026-03-15T22:41:06.829109Z","published":"2021-08-03T14:15:08.233Z","references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E"},{"type":"FIX","url":"https://github.com/freebsd/freebsd-src/commits/main/lib/libfetch"},{"type":"EVIDENCE","url":"https://gitlab.alpinelinux.org/alpine/apk-tools/-/issues/10749"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36159.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"2021-07-26"}]},{"events":[{"introduced":"0"},{"fixed":"2021-07-26"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}