CVE-2021-32727
mediumPriorität · verfolgen · 30EPSS 0.007 · 54. PerzentilEUUSEPSS · bewertet 2026-10-27
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 5–7.5
schwächen
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betroffene Produkte (3)
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Advisories (1)
Hersteller- und Ökosystem-Meldungen dazu.
- BIT-nextcloud-2021-32727End-to-end encryption device setup did not verify public key2026-07-12vendor · osvUS
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.
auch bekannt als (3)
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quellen
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Referenzen (14)
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/nextcloud/android/pull/8438cnnvd
- https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devicescnnvd
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736cnnvd
- https://hackerone.com/reports/1189162cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-32727cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021071215cnnvd
- https://github.com/nextcloud/android/pull/8438enisa_euvd
- https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devicesenisa_euvd
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