CVE-2021-22876

Name: CVE-2021-22876
Creator: NVD / NIST
Published: 2021-04-01T18:15:12.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 5.30%

Last modified Jun 17, 2026

CVE-2021-22876 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 5.30% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

5.30%

91.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Haxx	Libcurl	>= 7.1.1, <= 7.75.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Hci Compute Node	All versions
Netapp	Hci Storage Node	All versions
Broadcom	Fabric Operating System	All versions
Debian	Debian Linux	9.0
Siemens	Sinec Infrastructure Network Services	< 1.0.1.1
Oracle	Communications Billing And Revenue Management	12.0.0.3.0
Oracle	Essbase	21.2
Splunk	Universal Forwarder	>= 8.2.0, < 8.2.12
Splunk	Universal Forwarder	>= 9.0.0, < 9.0.6
Splunk	Universal Forwarder	9.1.0

References

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://curl.se/docs/CVE-2021-22876.htmlPatch, Vendor Advisory
https://hackerone.com/reports/1101882Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00019.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202105-36Third Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0007/Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://curl.se/docs/CVE-2021-22876.htmlPatch, Vendor Advisory
https://hackerone.com/reports/1101882Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00019.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202105-36Third Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0007/Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlThird Party Advisory

Timeline

Published: Apr 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22876?

How severe is CVE-2021-22876?

CVE-2021-22876 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 5.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22876?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22876?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST