CVE-2021-3524: Debian Linux

Medium severity, CVSS 6.5. EPSS: 1.6% chance of exploitation in the next 30 days.

A flaw was found in the Red Hat Ceph Storage RadosGW (Ceph Object Gateway) in versions before 14.2.21. The vulnerability is related to the injection of HTTP headers via a CORS ExposeHeader tag. The newline character in the ExposeHeader tag in the CORS configuration file generates a header injection in the response when the CORS request is made. In addition, the prior bug fix for CVE-2020-10753 did not account for the use of \r as a header separator, thus a new flaw has been created.

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Red Hat Ceph: before 14.2.21 (fixed in 14.2.21)
• Red Hat Ceph Storage: version 4.0 only

Published 2021-05-17. Last modified 2026-06-17.