{"id":"CVE-2021-3737","details":"A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.","aliases":["BIT-libpython-2021-3737","BIT-python-2021-3737","BIT-python-min-2021-3737","PSF-2022-7"],"modified":"2026-04-16T04:32:13.177051445Z","published":"2022-03-04T19:15:08.730Z","related":["ALSA-2021:4160","ALSA-2022:1764","ALSA-2022:1821","ALSA-2022:1986","SUSE-SU-2021:3477-1","SUSE-SU-2021:3486-1","SUSE-SU-2021:3489-1","SUSE-SU-2021:3524-1","SUSE-SU-2021:4015-1","SUSE-SU-2021:4015-2","SUSE-SU-2021:4104-1","SUSE-SU-2022:1485-1","openSUSE-SU-2021:1418-1","openSUSE-SU-2021:3489-1","openSUSE-SU-2021:4104-1","openSUSE-SU-2024:11202-1","openSUSE-SU-2024:11284-1","openSUSE-SU-2024:11286-1"],"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20220407-0009/"},{"type":"REPORT","url":"https://bugs.python.org/issue44022"},{"type":"FIX","url":"https://ubuntu.com/security/CVE-2021-3737"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"FIX","url":"https://github.com/python/cpython/pull/25916"},{"type":"FIX","url":"https://github.com/python/cpython/pull/26503"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1995162"},{"type":"FIX","url":"https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"5c4568a05a0a62b5947c55f68f9f2ecfb90a4f12"},{"fixed":"9a0099d1bf14bce417370aae6d55527417cda354"},{"introduced":"1bf9cc509326bc42cd8cb1650eb9bf64550d817e"},{"fixed":"9da28d2b3429d1bb30e082e4c9cb544d81fdae20"},{"introduced":"fa919fdf2583bdfead1df00e842f24f30b2a34bf"},{"fixed":"c3ffbbdf3d5645ee07c22649f2028f9dffc762ba"},{"introduced":"9cf6752276e6fcfd0c23fdb064ad27f448aaaf75"},{"fixed":"db3ff76da19004f266b62e98a81bdfd322861436"}],"database_specific":{"versions":[{"introduced":"3.6.0"},{"fixed":"3.6.14"},{"introduced":"3.7.0"},{"fixed":"3.7.11"},{"introduced":"3.8.0"},{"fixed":"3.8.11"},{"introduced":"3.9.0"},{"fixed":"3.9.6"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3737.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"6.0"}]},{"events":[{"introduced":"0"},{"last_affected":"7.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"33"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]},{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"20.04"}]},{"events":[{"introduced":"0"},{"last_affected":"21.04"}]},{"events":[{"introduced":"0"},{"last_affected":"22.1.3"}]},{"events":[{"introduced":"0"},{"last_affected":"22.1.1"}]},{"events":[{"introduced":"0"},{"last_affected":"22.2.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}