Medium 5.3Published Jun 11, 2021

CVE-2021-22897curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library.

Updated under an hour ago (Oct 27, 2026, 10:40 AM ET)

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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 24 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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Every CVE for Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Exploited in the last 30 days

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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

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 7.61.0 through 7.76.1	NVD
oracle communications_cloud_native_core_binding_support_function oracle:communications_cloud_native_core_binding_support_function	1.11.0	NVD
oracle communications_cloud_native_core_network_function_cloud_native_environment oracle:communications_cloud_native_core_network_function_cloud_native_environment	1.10.0	NVD
oracle communications_cloud_native_core_network_repository_function oracle:communications_cloud_native_core_network_repository_function	1.15.0; 1.15.1	NVD
oracle communications_cloud_native_core_network_slice_selection_function oracle:communications_cloud_native_core_network_slice_selection_function	1.8.0	NVD
oracle communications_cloud_native_core_service_communication_proxy oracle:communications_cloud_native_core_service_communication_proxy	1.15.0	NVD
oracle essbase oracle:essbase	before 11.1.2.4.047; from 21.0 before 21.3	NVD
1–10 of 25

References

References

https://hackerone.com/reports/1172857	x-refsource-misc, exploit, issue-tracking, third-party-advisory
https://curl.se/docs/CVE-2021-22897.html	x-refsource-misc, patch, vendor-advisory
https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511	x-refsource-misc, patch, third-party-advisory
https://www.oracle.com//security-alerts/cpujul2021.html	x-refsource-misc, patch, third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.html	x-refsource-misc, patch, third-party-advisory
https://security.netapp.com/advisory/ntap-20210727-0007/	x-refsource-confirm, third-party-advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	x-refsource-misc, patch, third-party-advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf	x-refsource-confirm, patch, 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.