CVE-2021-28544Public exploitNetwork attack vector

Protected repository path disclosure via log metadata

Published Apr 12, 2022 · Updated Aug 3, 2024

Information disclosure in Apache Subversion servers 1.10.0 through 1.14.1 allows remote authenticated users to read protected source paths. The detect_changed() helper retains and reports copyfrom path metadata after its authorization callback finds the source node unreadable. Path-based authorization and a readable node copied from a protected location are required; only the source path and fact of copying are disclosed, not contents.

CVSS severity4.3
Medium
EPSS probability2.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Apache Subversion servers 1.10.0 through 1.14.1 allows remote authenticated users to read protected source paths. The detect_changed() helper retains and reports copyfrom path metadata after its authorization callback finds the source node unreadable. Path-based authorization and a readable node copied from a protected location are required; only the source path and fact of copying are disclosed, not contents.

The record

CVE
CVE-2021-28544
Published
Apr 12, 2022
Updated
Aug 3, 2024
Vendor
The Apache Software Foundation
Product
Apache Subversion
Classifications
CWE-200, T1083
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.10.0 to 1.14.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Subversionversion=1.10.0 to 1.14.1

Published CVSS scores

4.3Apache Software FoundationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:P/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1083File and Directory Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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