CVE-2021-22905Network attack vector

Sharee search disclosure via default lookup routing

Published Jun 11, 2021 · Updated Aug 3, 2024

Information disclosure in Nextcloud Android app before 3.16.0 allows attackers to read sharee search terms through the lookup service. The sharee-search path sends queries to the public lookup server by default instead of limiting them to the configured local Nextcloud server. Disclosure occurs when a user performs an ordinary sharee search without explicitly choosing global search, exposing only the entered search data.

CVSS severity6.5
Medium
EPSS probability1.37%
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 Android app before 3.16.0 allows attackers to read sharee search terms through the lookup service. The sharee-search path sends queries to the public lookup server by default instead of limiting them to the configured local Nextcloud server. Disclosure occurs when a user performs an ordinary sharee search without explicitly choosing global search, exposing only the entered search data.

The record

CVE
CVE-2021-22905
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Android app
Classifications
CWE-200, CWE-201
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2021CVE 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=Fixed in 3.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Android appversion=Fixed in 3.16.0

Published CVSS scores

4.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-201Insertion of Sensitive Information Into Sent Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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