Medium 5.3Published Apr 1, 2021

CVE-2021-22876curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header.

Updated under an hour ago (Oct 27, 2026, 10:00 AM ET)

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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 14 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 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

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-359
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 libcurl haxx:libcurl	from 7.1.1 through 7.75.0	NVD
fedoraproject fedora fedoraproject:fedora	32; 33; 34	NVD
netapp hci_management_node netapp:hci_management_node	all versions	NVD
netapp solidfire netapp:solidfire	all versions	NVD
netapp hci_compute_node netapp:hci_compute_node	all versions	NVD
netapp hci_storage_node netapp:hci_storage_node	all versions	NVD
broadcom fabric_operating_system broadcom:fabric_operating_system	all versions	NVD
1–10 of 15

References

References

https://hackerone.com/reports/1101882	x-refsource-misc, exploit, issue-tracking, patch, third-party-advisory
https://curl.se/docs/CVE-2021-22876.html	x-refsource-misc, patch, vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/	vendor-advisory, x-refsource-fedora, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/	vendor-advisory, x-refsource-fedora, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/	vendor-advisory, x-refsource-fedora, mailing-list, third-party-advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html	mailing-list, x-refsource-mlist, third-party-advisory
https://security.gentoo.org/glsa/202105-36	vendor-advisory, x-refsource-gentoo, third-party-advisory
https://www.oracle.com//security-alerts/cpujul2021.html	x-refsource-misc, third-party-advisory
https://security.netapp.com/advisory/ntap-20210521-0007/	x-refsource-confirm, third-party-advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf	x-refsource-confirm, patch, third-party-advisory
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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.