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.
総合評価: CVE-2021-3737 は悪用リスクが高い（83.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 11.59%、95 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 直近 1 日で EPSS が +11.47% 上昇。悪用への関心が高まっている可能性があります。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.12% | 11.59% | +11.47% |
| 2 | 2026-02-07 | 0.16% | 0.12% | -0.04% |
| 3 | 2026-02-04 | — | 0.16% | — |
EPSS の全履歴 （全 35 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| 7.1 | 2.0 | HIGH |
|
8.6 | 6.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-3737 not yet assigned priority: Debian including 3 source packages (pypy3, python2.7, python3.9), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6, open 1. | https://security-tracker.debian.org/tracker/CVE-2021-3737 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2021-3737 |
suse
|
medium | CVE-2021-3737 severity moderate: SUSE including 637 source package names (0.0.17-1.1:libpython3_6m1_0-3.6.15-10.9.1, 0.0.17-1.1:python3-3.6.15-10.9.1, …), 2315 product×package rows across 432 product lines (Container bci/bci-base-fips, Container bci/bci-sle15-kernel-module-devel, … (432 product lines)): Fixed 2152, Known Affected 163. | https://www.suse.com/security/cve/CVE-2021-3737/ |
ubuntu
|
medium | CVE-2021-3737 medium priority: Ubuntu including 7 source packages (python3.10, python3.4, …), 91 status rows across 13 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): DNE 64, released 9, ignored 7, needs-triage 7, not-affected 4. | https://ubuntu.com/security/CVE-2021-3737 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| python | python | >= 3.6.0, < 3.6.14 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.7.0, < 3.7.11 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.8.0, < 3.8.11 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python | python | >= 3.9.0, < 3.9.6 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| redhat | codeready_linux_builder | 8.0 | cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* |
| redhat | codeready_linux_builder_for_ibm_z_systems | 8.0 | cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* |
| redhat | codeready_linux_builder_for_power_little_endian | 8.0 | cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 6.0 | cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 7.0 | cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 8.0 | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_for_ibm_z_systems | 8.0 | cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_for_power_little_endian | 8.0 | cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| fedoraproject | fedora | 34 | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 14.04 | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* |
| canonical | ubuntu_linux | 16.04 | cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* |
| canonical | ubuntu_linux | 18.04 | cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 20.04 | cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 21.04 | cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:* |
| netapp | hci | — | cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:* |
| netapp | management_services_for_element_software | — | cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:* |
| netapp | netapp_xcp_smb | — | cpe:2.3:a:netapp:netapp_xcp_smb:-:*:*:*:*:*:*:* |
| netapp | ontap_select_deploy_administration_utility | — | cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* |
| netapp | xcp_nfs | — | cpe:2.3:a:netapp:xcp_nfs:-:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_binding_support_function | 22.1.3 | cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_exposure_function | 22.1.1 | cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_policy | 22.2.0 | cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugs.python.org/issue44022 | Exploit Issue Tracking Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1995162 | Issue Tracking Patch Third Party Advisory |
| https://github.com/python/cpython/pull/25916 | Patch Third Party Advisory |
| https://github.com/python/cpython/pull/26503 | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html | |
| https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html | |
| https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html | Patch Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220407-0009/ | Third Party Advisory |
| https://ubuntu.com/security/CVE-2021-3737 | Patch Third Party Advisory |
| https://www.oracle.com/security-alerts/cpujul2022.html | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html | |
| https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html |