High 7.5Published Sep 28, 2021

CVE-2021-22946A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSES…

Updated under an hour ago (Oct 27, 2026, 7:30 PM ET)

Does this affect you?

It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 31 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Exploited in the last 30 days

A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-325, CWE-319
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 7.20.0 before 7.79.0	NVD
debian debian_linux debian:debian_linux	9.0; 10.0; 11.0	NVD
fedoraproject fedora fedoraproject:fedora	33; 35	NVD
netapp cloud_backup netapp:cloud_backup	all versions	NVD
netapp clustered_data_ontap netapp:clustered_data_ontap	all versions	NVD
netapp oncommand_insight netapp:oncommand_insight	all versions	NVD
netapp oncommand_workflow_automation netapp:oncommand_workflow_automation	all versions	NVD
1–10 of 32

References

References

https://hackerone.com/reports/1334111	exploit, issue-tracking, patch, third-party-advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html	mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/	vendor-advisory, mailing-list, third-party-advisory
https://www.oracle.com/security-alerts/cpuoct2021.html	patch, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/	vendor-advisory, mailing-list, third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.html	third-party-advisory
https://security.netapp.com/advisory/ntap-20211029-0003/	third-party-advisory
https://security.netapp.com/advisory/ntap-20220121-0008/	third-party-advisory
http://seclists.org/fulldisclosure/2022/Mar/29	mailing-list, third-party-advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	patch, third-party-advisory
1–10 of 19

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.