CVE-2021-32658

Sensitive-data exposure via incomplete account cleanup

Published Jun 8, 2021 · Updated Aug 3, 2024

Sensitive-data exposure in Nextcloud Android Client before 3.16.1 allows local users to recover residual account secrets after removal. A timeout in the account-removal cleanup path can end deletion before stored sensitive material, including end-to-end encryption keys, is erased. Exploitation requires access to the device and residual application storage after account removal, and the demonstrated consequence is disclosure rather than data modification or service interruption.

CVSS severity4.7
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data exposure in Nextcloud Android Client before 3.16.1 allows local users to recover residual account secrets after removal. A timeout in the account-removal cleanup path can end deletion before stored sensitive material, including end-to-end encryption keys, is erased. Exploitation requires access to the device and residual application storage after account removal, and the demonstrated consequence is disclosure rather than data modification or service interruption.

The record

CVE
CVE-2021-32658
Published
Jun 8, 2021
Updated
Aug 3, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Security Advisories
Classifications
CWE-1266, T1409
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 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=< 3.16.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Security Advisoriesversion=< 3.16.1

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
4.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.7GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1266Improper Scrubbing of Sensitive Data from Decommissioned Device
T1409Stored Application 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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