CVE-2021-22926libcurl-using applications can ask for a specific client certificate to be used in a transfer.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 21 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
libcurl-using applications can ask for a specific client certificate to be used in a transfer. This is done with the `CURLOPT_SSLCERT` option (`--cert` with the command line tool).When libcurl is built to use the macOS native TLS library Secure Transport, an application can ask for the client certificate by name or with a file name - using the same option. If the name exists as a file, it will be used instead of by name.If the appliction runs with a current working directory that is writable by other users (like `/tmp`), a malicious user can create a file name with the same name as the app wants to use by name, and thereby trick the application to use the file based cert instead of the one referred to by name making libcurl send the wrong client certificate in the TLS connection handshake.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-840
- 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 curl haxx:curl | from 7.33.0 before 7.78.0 | NVD |
netapp active_iq_unified_manager netapp:active_iq_unified_manager | all versions; all versions | NVD |
netapp clustered_data_ontap netapp:clustered_data_ontap | all versions | NVD |
netapp hci_management_node netapp:hci_management_node | all versions | NVD |
netapp oncommand_insight netapp:oncommand_insight | all versions | NVD |
netapp oncommand_workflow_automation netapp:oncommand_workflow_automation | all versions | NVD |
netapp snapcenter netapp:snapcenter | all versions | NVD |
netapp solidfire netapp:solidfire | all versions | NVD |
oracle mysql_server oracle:mysql_server | from 5.7.0 through 5.7.35; 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 |
netapp h300s_firmware netapp:h300s_firmware | all versions | NVD |
netapp h300e_firmware netapp:h300e_firmware | all versions | NVD |
netapp h500e_firmware netapp:h500e_firmware | all versions | NVD |
netapp h500s_firmware netapp:h500s_firmware | all versions | NVD |
netapp h700s_firmware netapp:h700s_firmware | all versions | NVD |
netapp h700e_firmware netapp:h700e_firmware | all versions | NVD |
netapp h410s_firmware netapp:h410s_firmware | all versions | 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/1234760exploit, third-party-advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3Emailing-list, third-party-advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3Emailing-list, third-party-advisory
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3Emailing-list, third-party-advisory
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3Emailing-list, third-party-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlpatch, third-party-advisory
- https://security.netapp.com/advisory/ntap-20210902-0003/third-party-advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlpatch, third-party-advisory
- https://security.netapp.com/advisory/ntap-20211022-0003/third-party-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfpatch, third-party-advisory
- https://security.gentoo.org/glsa/202212-01vendor-advisory, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-389290.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.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.