What’s Vulnerable › Vulnerabilities

CVE-2021-28544: Apache Subversion SVN authz protected copyfrom paths regression

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-04-12 · updated 2026-06-17
• Weakness: CWE-200

Description

Apache Subversion SVN authz protected copyfrom paths regression Subversion servers reveal 'copyfrom' paths that should be hidden according to configured path-based authorization (authz) rules. When a node has been copied from a protected location, users with access to the copy can see the 'copyfrom' path of the original. This also reveals the fact that the node was copied. Only the 'copyfrom' path is revealed; not its contents. Both httpd and svnserve servers are vulnerable.

Affected products

• Apache Software Foundation Apache Subversion: from 1.10.0 through 1.14.1
• Apple macOS: from 12.0 before 12.5 — fixed in 12.5
• Debian Linux: 10.0, 11.0
• Fedoraproject Fedora: 35, 36

How to fix

Upgrade to a fixed version: Apple macOS 12.5. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2022/Jul/18
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PZ4ARNGLMGYBKYDX2B7DRBNMF6EH3A6R/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJPMCWCGWBN3QWCDVILWQWPC75RR67LT/
• https://subversion.apache.org/security/CVE-2021-28544-advisory.txt
• https://support.apple.com/kb/HT213345
• https://www.debian.org/security/2022/dsa-5119
• http://seclists.org/fulldisclosure/2022/Jul/18
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PZ4ARNGLMGYBKYDX2B7DRBNMF6EH3A6R/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJPMCWCGWBN3QWCDVILWQWPC75RR67LT/
• https://subversion.apache.org/security/CVE-2021-28544-advisory.txt
• https://support.apple.com/kb/HT213345
• https://www.debian.org/security/2022/dsa-5119

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