CVE-2021-28544

Name: CVE-2021-28544
Creator: NVD / NIST
Published: 2022-04-12T18:15:08.25+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 2.70%

Last modified Jun 17, 2026

CVE-2021-28544 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 2.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

2.70%

84.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Subversion	>= 1.10.0, <= 1.14.1
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36
Apple	Macos	>= 12.0, < 12.5

References

http://seclists.org/fulldisclosure/2022/Jul/18Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PZ4ARNGLMGYBKYDX2B7DRBNMF6EH3A6R/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJPMCWCGWBN3QWCDVILWQWPC75RR67LT/Mailing List, Third Party Advisory
https://subversion.apache.org/security/CVE-2021-28544-advisory.txtExploit, Patch, Vendor Advisory
https://support.apple.com/kb/HT213345Third Party Advisory
https://www.debian.org/security/2022/dsa-5119Third Party Advisory
http://seclists.org/fulldisclosure/2022/Jul/18Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PZ4ARNGLMGYBKYDX2B7DRBNMF6EH3A6R/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJPMCWCGWBN3QWCDVILWQWPC75RR67LT/Mailing List, Third Party Advisory
https://subversion.apache.org/security/CVE-2021-28544-advisory.txtExploit, Patch, Vendor Advisory
https://support.apple.com/kb/HT213345Third Party Advisory
https://www.debian.org/security/2022/dsa-5119Third Party Advisory

Timeline

Published: Apr 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28544?

How severe is CVE-2021-28544?

CVE-2021-28544 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 2.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28544?

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-2021-28544?

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

Scan your code now

Source: NVD / NIST