Skip to content
Noroxi
CVE-2021-28544· NVD / CVE Program· CNA apache

Apache Subversion SVN authz protected copyfrom paths regression

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.7% (FIRST EPSS); higher than 86.2% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: subversion (Alpine:v3.13) 1.14.2-r0; subversion (Debian:10) 1.10.4-1+deb10u3; subversion (Debian:11) 1.14.1-3+deb11u1.

Low priority for now. Upgrade to subversion (Alpine:v3.13) 1.14.2-r0; subversion (Debian:10) 1.10.4-1+deb10u3; subversion (Debian:11) 1.14.1-3+deb11u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Apr 12, 2022
Updated
Jun 16, 2026
EPSS
2.7% · 86th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.7%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-28544

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for apache records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachesubversion
debiandebian linux
fedoraprojectfedora
applemacos

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache subversion1.10.0 and later · up to 1.14.1 inclusive
  • apple macos12.0 and later · before 12.5
  • debian debian linux10.0
  • debian debian linux11.0
  • fedoraproject fedora35
  • fedoraproject fedora36

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache Subversion

    • 1.10.0 to 1.14.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.13subversionfrom 1.10.0 · before 1.14.2-r01.14.2-r0
Debian:10subversionbefore 1.10.4-1+deb10u31.10.4-1+deb10u3
Debian:11subversionbefore 1.14.1-3+deb11u11.14.1-3+deb11u1
Debian:12subversionbefore 1.14.2-11.14.2-1
SUSE:Linux Enterprise High Performance Computing 15-ESPOSsubversionbefore 1.10.6-150000.3.21.11.10.6-150000.3.21.1
SUSE:Linux Enterprise Module for Basesystem 15 SP3subversionbefore 1.10.6-150300.10.8.11.10.6-150300.10.8.1
SUSE:Linux Enterprise Module for Basesystem 15 SP3subversionbefore 1.10.6-150300.10.8.11.10.6-150300.10.8.1
SUSE:Linux Enterprise Software Development Kit 12 SP5subversionbefore 1.10.6-3.6.11.10.6-3.6.1

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-5259Integer overflow in the read_string function in libsvn_ra_svn/marshal.c in Apache Subversion 1.9.x before 1.9.3 allows remote attackers to e
    51Plan
  • CVE-2018-11803Subversion's mod_dav_svn Apache HTTPD module versions 1.11.0 and 1.10.0 to 1.10.3 will crash after dereferencing an uninitialized pointer if
    48Plan
  • CVE-2017-9800A maliciously constructed svn+ssh:// URL would cause Subversion clients before 1.8.19, 1.9.x before 1.9.7, and 1.10.0.x through 1.10.0-alpha
    45Plan

Published before and after this one in the same product

  • ← EarlierCVE-2019-0203Sep 26, 2019 · In Apache Subversion versions up to and including 1.9.10, 1.10.4, 1.12.0, Subversion's svnserve server process may exit when a client sends
    31Monitor
  • ← EarlierCVE-2020-17525Mar 17, 2021 · Remote unauthenticated denial-of-service in Subversion mod_authz_svn
    42Plan
  • Later →CVE-2022-24070Apr 12, 2022 · Apache Subversion mod_dav_svn is vulnerable to memory corruption
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:subversion1.14.2-r0 · Alpine:v3.13Package registry (OSV)
debian:subversion1.14.2-1 · Debian:12Package registry (OSV)
opensuse:subversion1.10.6-150300.10.8.1 · openSUSE:Leap 15.3Package registry (OSV)
suse:subversion1.10.6-150000.3.21.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOSPackage registry (OSV)
suse:subversion1.10.6-150300.10.8.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

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

nvd-primary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records