When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.
総合評価: CVE-2021-22947 は悪用リスクが高い（70.7/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 2.80%、85 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 +2.55% 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 | 0.25% | 2.80% | +2.55% |
| 2 | 2026-03-04 | 0.64% | 0.25% | -0.39% |
| 3 | 2026-03-01 | — | 0.64% | — |
EPSS の全履歴 （全 47 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 |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2021-22947: 1 source package rows (curl); 139 state rows across 9 repos (3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 9, open 130. | https://security.alpinelinux.org/vuln/CVE-2021-22947 |
debian
|
not yet assigned | CVE-2021-22947 not yet assigned priority: Debian including 1 source packages (curl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-22947 |
gentoo
|
high | CVE-2021-22947: 1 GLSA(s) (202212-01), 1 atom(s) (net-misc/curl); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-22947 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-22947 |
suse
|
medium | CVE-2021-22947 severity moderate: SUSE including 406 source package names (0.1.0:libcurl4-7.60.0-25.1, 0.1.75:libcurl4-7.60.0-25.1, …), 641 product×package rows across 198 product lines (Container bci/bci-init, Container bci/dotnet-aspnet, … (198 product lines)): Fixed 487, Known Affected 154. | https://www.suse.com/security/cve/CVE-2021-22947/ |
ubuntu
|
medium | CVE-2021-22947 medium priority: Ubuntu including 1 source packages (curl), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): released 7, needs-triage 1. | https://ubuntu.com/security/CVE-2021-22947 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| haxx | curl | >= 7.20.0, < 7.79.0 | cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| fedoraproject | fedora | 35 | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| netapp | cloud_backup | — | cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* |
| netapp | clustered_data_ontap | — | cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* |
| netapp | h300s_firmware | — | cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* |
| netapp | h500s_firmware | — | cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* |
| netapp | h700s_firmware | — | cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* |
| netapp | h300e_firmware | — | cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:* |
| netapp | h500e_firmware | — | cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:* |
| netapp | h700e_firmware | — | cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:* |
| netapp | h410s_firmware | — | cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* |
| netapp | solidfire_baseboard_management_controller_firmware | — | cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_binding_support_function | 1.11.0 | cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_function_cloud_native_environment | 1.10.0 | cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_repository_function | 1.15.0 | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_repository_function | 1.15.1 | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.1:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_slice_selection_function | 1.8.0 | cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_service_communication_proxy | 1.15.0 | cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.15.0:*:*:*:*:*:*:* |
| oracle | mysql_server | >= 5.7.0, <= 5.7.35 | cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* |
| oracle | mysql_server | >= 8.0.0, <= 8.0.26 | cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.57 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.58 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:* |
| oracle | peoplesoft_enterprise_peopletools | 8.59 | cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:* |
| siemens | sinec_infrastructure_network_services | < 1.0.1.1 | cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* |
| apple | macos | < 12.3 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
| oracle | commerce_guided_search | 11.3.2 | cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:* |
| 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_console | 22.2.0 | cpe:2.3:a:oracle:communications_cloud_native_core_console:22.2.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_repository_function | 22.1.2 | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:22.1.2:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_network_repository_function | 22.2.0 | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:22.2.0:*:*:*:*:*:*:* |
| oracle | communications_cloud_native_core_security_edge_protection_proxy | 22.1.1 | cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:22.1.1:*:*:*:*:*:*:* |
| splunk | universal_forwarder | >= 8.2.0, < 8.2.12 | cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:* |
| splunk | universal_forwarder | >= 9.0.0, < 9.0.6 | cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:* |
| splunk | universal_forwarder | 9.1.0 | cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:* |