CVE-2025-1021Network attack vector

Arbitrary file read via writable NFS service

Published Apr 23, 2025 · Updated Apr 23, 2025

Missing authorization in synocopy in Synology DiskStation Manager allows remote attackers to read arbitrary files through writable NFS. Synology identifies synocopy and a writable NFS service but has not disclosed which authorization check is omitted or how a file path reaches the component. The NFS service must be enabled and writable from the attacker's network position; published impact is limited to file disclosure, with no reported write or service interruption.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in synocopy in Synology DiskStation Manager allows remote attackers to read arbitrary files through writable NFS. Synology identifies synocopy and a writable NFS service but has not disclosed which authorization check is omitted or how a file path reaches the component. The NFS service must be enabled and writable from the attacker's network position; published impact is limited to file disclosure, with no reported write or service interruption.

The record

CVE
CVE-2025-1021
Published
Apr 23, 2025
Updated
Apr 23, 2025
Vendor
Synology
Product
DiskStation Manager
Classifications
CWE-862, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=7.1 <7.1.1-42962-8
  2. Affected versionversion=7.2.1 <7.2.1-69057-7
  3. Affected versionversion=7.2.2 <7.2.2-72806-3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Synology · DiskStation Managerversion=7.1 <7.1.1-42962-8; version=7.2.1 <7.2.1-69057-7; version=7.2.2 <7.2.2-72806-3

Published CVSS scores

7.5Synology Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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