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Low 3.7Published Aug 5, 2021
CVE-2021-22924libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take…
Updated under an hour ago ()
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 35 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
- CVSS
- 3.7 LOW (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- hackerone
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
haxx libcurl haxx:libcurl | from 7.10.4 before 7.77.0 | NVD |
fedoraproject fedora fedoraproject:fedora | 33 | NVD |
debian debian_linux debian:debian_linux | 9.0; 10.0; 11.0 | NVD |
netapp cloud_backup netapp:cloud_backup | all versions | NVD |
netapp clustered_data_ontap netapp:clustered_data_ontap | all versions | NVD |
netapp solidfire_&_hci_management_node netapp:solidfire_&_hci_management_node | all versions | NVD |
netapp solidfire_baseboard_management_controller_firmware netapp:solidfire_baseboard_management_controller_firmware | all versions | NVD |
oracle mysql_server oracle:mysql_server | from 5.7.0 through 5.7.36; from 8.0.0 through 8.0.26 | NVD |
oracle peoplesoft_enterprise_peopletools oracle:peoplesoft_enterprise_peopletools | 8.57; 8.58; 8.59 | NVD |
siemens sinec_infrastructure_network_services siemens:sinec_infrastructure_network_services | before 1.0.1.1 | NVD |
siemens sinema_remote_connect_server siemens:sinema_remote_connect_server | before 3.1 | NVD |
siemens logo!_cmr2040_firmware siemens:logo!_cmr2040_firmware | all versions | NVD |
siemens logo!_cmr2020_firmware siemens:logo!_cmr2020_firmware | all versions | NVD |
siemens ruggedcomrm_1224_lte_firmware siemens:ruggedcomrm_1224_lte_firmware | before 7.1 | NVD |
siemens scalance_m804pb_firmware siemens:scalance_m804pb_firmware | before 7.1 | NVD |
siemens scalance_m812-1_firmware siemens:scalance_m812-1_firmware | before 7.1 | NVD |
siemens scalance_m816-1_firmware siemens:scalance_m816-1_firmware | before 7.1 | NVD |
siemens scalance_m826-2_firmware siemens:scalance_m826-2_firmware | before 7.1 | NVD |
siemens scalance_m874-2_firmware siemens:scalance_m874-2_firmware | before 7.1 | NVD |
siemens scalance_m874-3_firmware siemens:scalance_m874-3_firmware | before 7.1 | NVD |
siemens scalance_m876-3_firmware siemens:scalance_m876-3_firmware | before 7.1 | NVD |
siemens scalance_m876-4_firmware siemens:scalance_m876-4_firmware | before 7.1 | NVD |
siemens scalance_mum856-1_firmware siemens:scalance_mum856-1_firmware | before 7.1 | NVD |
siemens scalance_s615_firmware siemens:scalance_s615_firmware | before 7.1 | NVD |
siemens simatic_cp_1543-1_firmware siemens:simatic_cp_1543-1_firmware | before 3.0.22 | NVD |
siemens simatic_cp_1545-1_firmware siemens:simatic_cp_1545-1_firmware | before 1.1 | NVD |
siemens simatic_rtu3010c_firmware siemens:simatic_rtu3010c_firmware | before 5.0.14 | NVD |
siemens simatic_rtu3030c_firmware siemens:simatic_rtu3030c_firmware | before 5.0.14 | NVD |
siemens simatic_rtu3031c_firmware siemens:simatic_rtu3031c_firmware | before 5.0.14 | NVD |
siemens simatic_rtu_3041c_firmware siemens:simatic_rtu_3041c_firmware | before 5.0.14 | NVD |
siemens sinema_remote_connect siemens:sinema_remote_connect | before 3.1 | NVD |
siemens siplus_net_cp_1543-1_firmware siemens:siplus_net_cp_1543-1_firmware | before 3.0.22 | NVD |
splunk universal_forwarder splunk:universal_forwarder | from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 | NVD |
References
- https://hackerone.com/reports/1223565x-refsource-misc, exploit, issue-tracking, patch, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/vendor-advisory, x-refsource-fedora, mailing-list, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00017.htmlmailing-list, x-refsource-mlist, third-party-advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3Emailing-list, x-refsource-mlist, third-party-advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3Emailing-list, x-refsource-mlist, third-party-advisory
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3Emailing-list, x-refsource-mlist, third-party-advisory
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3Emailing-list, x-refsource-mlist, third-party-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlx-refsource-misc, patch, third-party-advisory
- https://security.netapp.com/advisory/ntap-20210902-0003/x-refsource-confirm, third-party-advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlx-refsource-misc, patch, third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfx-refsource-confirm, patch, third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdfx-refsource-confirm, third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfx-refsource-confirm, third-party-advisory
- https://www.debian.org/security/2022/dsa-5197vendor-advisory, x-refsource-debian, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2022/08/msg00017.htmlmailing-list, x-refsource-mlist, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-389290.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-484086.html
- https://cert-portal.siemens.com/productcert/html/ssa-732250.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.