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CVE-2021-28544

19
FAUCET Score

CVE-2021-28544 is a medium-severity vulnerability affecting Apache Subversion (SVN) servers, including those used by Apple, Debian, and Fedora. It allows authenticated users to discover 'copyfrom' paths of protected resources, revealing the origin of copied files even if the original path should be hidden by authorization rules. The attack is network-based and low complexity, but only exposes the path, not its contents, resulting in a low confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.10.0, <= 1.14.1CPE matchmatch criteria
cpe:2.3:a:apache:subversion:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.79%
Probability of exploitation in next 30 days
EPSS Percentile
84.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0279 is in the 95th percentile among its peer group of 21,977 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

microsoftpatch availablevia msrc
Product: 18744-16823Fixed in: 1.14.2-1
microsoftpatch availablevia msrc
Product: cm1 subversion 1.14.0-5 on CBL Mariner 1.0Fixed in: 1.14.0-5
microsoftpatch availablevia msrc
Product: cbl2 subversion 1.14.2-1 on CBL Mariner 2.0Fixed in: 1.14.2-1
microsoftpatch availablevia msrc
Product: 18743-16820Fixed in: 1.14.0-5
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: subversion:1.14/subversion
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: subversion:1.10/subversion
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: subversion

Vendor Advisories (2)

microsoft2022-Apr/CVE-2021-28544Moderate

Apache Subversion SVN authz protected copyfrom paths regression

Apr 12, 2022
redhatCVE-2021-28544Low

subversion: SVN authz protected copyfrom paths regression

Mar 27, 2022

References

seclists.org / fulldisclosure/2022/Jul/18
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/PZ4ARNGLMGYBKYDX2B7DRBNMF6EH3A6R
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YJPMCWCGWBN3QWCDVILWQWPC75RR67LT
Mailing ListThird Party Advisory
subversion.apache.org / security/CVE-2021-28544-advisory.txt
ExploitPatchVendor Advisory
support.apple.com / kb/HT213345
Third Party Advisory
debian.org / security/2022/dsa-5119
Third Party Advisory