CVE-2021-39224Network attack vector

File path disclosure via verbatim exception responses

Published Oct 25, 2021 · Updated Aug 4, 2024

Information disclosure in Nextcloud OfficeOnline before 1.1.1 allows remote authenticated users to reveal shared-file server paths. OfficeOnline controllers returned underlying exception messages verbatim instead of replacing them with a generic error, exposing full filesystem paths for shared files. Reaching the disclosure requires low-privileged network access and user interaction with a shared file; the published impact is limited to path information.

CVSS severity3.5
Low
EPSS probability0.88%
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 Nextcloud OfficeOnline before 1.1.1 allows remote authenticated users to reveal shared-file server paths. OfficeOnline controllers returned underlying exception messages verbatim instead of replacing them with a generic error, exposing full filesystem paths for shared files. Reaching the disclosure requires low-privileged network access and user interaction with a shared file; the published impact is limited to path information.

The record

CVE
CVE-2021-39224
Published
Oct 25, 2021
Updated
Aug 4, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Security Advisories
Classifications
CWE-200, T1083
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Security Advisoriesversion=< 1.1.1

Published CVSS scores

3.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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 exploitUnconfirmed

Weakness, pattern, technique

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

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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