What’s Vulnerable › Vulnerabilities
CVE-2021-22876
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 5.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-04-01 · updated 2026-10-14
- Weakness: CWE-359
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.
Affected products
- Brocade Fabric OS: all versions
- Debian Linux: 9.0
- Fedoraproject Fedora: 32, 33, 34
- curl: from 7.1.1 through 7.75.0
- NetApp Hci Compute Node: all versions
- NetApp Hci Management Node: all versions
- NetApp Hci Storage Node: all versions
- NetApp Solidfire: all versions
- Oracle Corporation Communications Billing and Revenue Management: 12.0.0.3.0
- Oracle Corporation Oracle Essbase: 21.2
- Siemens Sinec Infrastructure Network Services: before 1.0.1.1 — fixed in 1.0.1.1
- Splunk Universal Forwarder: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6
How to fix
Upgrade to a fixed version: Siemens Sinec Infrastructure Network Services 1.0.1.1; Splunk Universal Forwarder 8.2.12, 9.0.6. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://curl.se/docs/CVE-2021-22876.html
- https://hackerone.com/reports/1101882
- https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/
- https://security.gentoo.org/glsa/202105-36
- https://security.netapp.com/advisory/ntap-20210521-0007/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://curl.se/docs/CVE-2021-22876.html
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