CVE-2022-27617Network attack vector

Authenticated file disclosure via webapi path traversal

Published Aug 3, 2022 · Updated Sep 16, 2024

Path traversal in Synology Calendar before 2.3.4-0631 allows remote authenticated users to download arbitrary files through its webapi. Synology identifies the webapi component but has not disclosed the affected endpoint, pathname field, or how input escapes the intended directory. A valid account and network access to the web application are required, and the reported consequence is file disclosure without file modification or service interruption.

CVSS severity5.0
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Synology Calendar before 2.3.4-0631 allows remote authenticated users to download arbitrary files through its webapi. Synology identifies the webapi component but has not disclosed the affected endpoint, pathname field, or how input escapes the intended directory. A valid account and network access to the web application are required, and the reported consequence is file disclosure without file modification or service interruption.

The record

CVE
CVE-2022-27617
Published
Aug 3, 2022
Updated
Sep 16, 2024
Vendor
Synology
Product
Synology Calendar
Classifications
CWE-22, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <2.3.4-0631

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Synology · Synology Calendarversion=unspecified <2.3.4-0631

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.0SynologyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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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