{"id":"UBUNTU-CVE-2021-3177","details":"Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Python applications that accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used unsafely.","modified":"2026-04-22T14:46:23.484409Z","published":"2021-01-19T06:15:00Z","related":["USN-4754-1","USN-4754-2 (regression in python2.7)","USN-4754-3","USN-4754-4","USN-4754-5","USN-6891-1"],"upstream":["CVE-2021-3177"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3177"},{"type":"REPORT","url":"https://bugs.python.org/issue42938"},{"type":"REPORT","url":"https://github.com/python/cpython/pull/24239"},{"type":"REPORT","url":"https://python-security.readthedocs.io/vuln/ctypes-buffer-overflow-pycarg_repr.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-4"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-3"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4754-5"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3177"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6891-1"}],"affected":[{"package":{"name":"python2.7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/python2.7@2.7.6-8ubuntu0.6+esm10?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.6-8ubuntu0.6+esm10"}]}],"versions":["2.7.5-8ubuntu3","2.7.5-8ubuntu4","2.7.6-2","2.7.6-2ubuntu1","2.7.6-3","2.7.6-3ubuntu1","2.7.6-4","2.7.6-4ubuntu1","2.7.6-5","2.7.6-7","2.7.6-8","2.7.6-8ubuntu0.2","2.7.6-8ubuntu0.3","2.7.6-8ubuntu0.4","2.7.6-8ubuntu0.5","2.7.6-8ubuntu0.6+esm2","2.7.6-8ubuntu0.6+esm3","2.7.6-8ubuntu0.6+esm5","2.7.6-8ubuntu0.6+esm6","2.7.6-8ubuntu0.6+esm7","2.7.6-8ubuntu0.6+esm8","2.7.6-8ubuntu0.6+esm9"],"ecosystem_specific":{"availability":"Available 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