CVE-2021-22876
MEDIUMCVSS 5.3/10EPSS 5.30%
Last modified
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/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-22876?
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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