CVE-2021-28544: Apache Subversion SVN authz protected copyfrom paths regression Subversion servers reveal 'copyfrom' paths tha

Q: How do I fix CVE-2021-28544?

subversion: upgrade to newer than 1.14.1; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-28544 being exploited?

CVE-2021-28544 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-28544 affect?

CVE-2021-28544 affects subversion, debian linux, fedora. Severity is medium (CVSS 4.3). 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 lo

Q: How urgent is CVE-2021-28544?

Priority 47/100. Public exploit reference; On your watchlist

This month

MEDIUM 4.3WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2021-28544 is a medium-severity flaw (CVSS 4.3) affecting subversion, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 svn

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-200
Published	2022-04-12
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache · apple · debian · fedoraproject

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-12 18:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

apache subversion UPGRADE

Affected: >= 1.10.0 and <= 1.14.1

Fixed in: newer than 1.14.1

Safe to downgrade to: a release before 1.10.0

1. Check installed version

apt-cache policy subversion || rpm -q subversion || subversion --version

2. UPGRADE to newer than 1.14.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade subversion

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade subversion

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.10.0 (Debian / Ubuntu)

apt-cache madison subversion sudo apt install subversion=<VERSION_BEFORE_1.10.0> sudo apt-mark hold subversion

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list subversion sudo dnf downgrade subversion-<VERSION_BEFORE_1.10.0> sudo dnf versionlock add subversion

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 10.0 · 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 35 · 36

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

apple macos UPGRADE

Affected: >= 12.0 and < 12.5

Fixed in: 12.5

Safe to downgrade to: a release before 12.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-28544?

subversion: upgrade to newer than 1.14.1; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-28544 being exploited?

CVE-2021-28544 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-28544 affect?

CVE-2021-28544 affects subversion, debian linux, fedora. Severity is medium (CVSS 4.3). 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 lo

How urgent is CVE-2021-28544?

Priority 47/100. Public exploit reference; On your watchlist

Software pages

Apache HTTP Server vulnerabilities · Debian vulnerabilities · macOS vulnerabilities

Related CVEs

CVE-2024-46901 LOW 3.1 UPGRADE MITIGATE Insufficient validation of filenames against control characters in Apache Subversion repositories served via m
CVE-2024-45720 HIGH 8.2 UPGRADE On Windows platforms, a "best fit" character encoding conversion of command line arguments to Subversion's exe
CVE-2022-29048 MEDIUM 4.3 UPGRADE UPGRADE A cross-site request forgery (CSRF) vulnerability in Jenkins Subversion Plugin 2.15.3 and earlier allows attac
CVE-2022-29046 MEDIUM 5.4 UPGRADE UPGRADE Jenkins Subversion Plugin 2.15.3 and earlier does not escape the name and description of List Subversion tags
CVE-2022-24070 HIGH 7.5 UPGRADE MITIGATE Subversion's mod_dav_svn is vulnerable to memory corruption

References

← Back to latest CVEs