{"cve":"CVE-2021-3177","nvd":{"published":"2021-01-19T06:15:12.967","modified":"2026-10-14T10:17:38.433","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-120"],"references":["https://bugs.python.org/issue42938","https://github.com/python/cpython/pull/24239","https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E","https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html","https://lists.debian.org/debian-lts-announce/2022/02/msg00013.html"],"products":["debian:debian_linux","fedoraproject:fedora","netapp:active_iq_unified_manager","netapp:ontap_select_deploy_administration_utility","oracle:communications_cloud_native_core_network_function_cloud_native_environment","oracle:communications_offline_mediation_controller","oracle:communications_pricing_design_center","oracle:enterprise_manager_ops_center","oracle:zfs_storage_appliance_kit","python:python"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2021-3177","score":0.24216,"percentile":0.97841,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}