{"answers":{"affected":"1 open source package ship an affected version, including nextcloud. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-32727 in the wild and no public exploit code.","fix":"Upgrade nextcloud to 3.16.1 or later.","what":"CVE-2021-32727 is a medium-severity vulnerability in nextcloud security-advisories, published on 12 Jul 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-32727 and fix it if it is affected.\n\nWhat it is: CVE-2021-32727 is a medium-severity vulnerability in nextcloud security-advisories, published on 12 Jul 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-32727 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- nextcloud (Bitnami): affected all versions; fixed in 3.16.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-32727/ (Markdown: https://insights.sbomify.com/CVE-2021-32727/index.md)","id":"CVE-2021-32727","markdown":"https://insights.sbomify.com/CVE-2021-32727/index.md","name":"CVE-2021-32727","record":{"aliases":["BIT-nextcloud-2021-32727","GHSA-5v33-r9cm-7736"],"analysis":{"component_type":"mobile_application","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Nextcloud Android Client","requires_auth":"low_privilege","summary":"Attackers can bypass end-to-end encryption verification to access encrypted data if a malicious public key is served by the Nextcloud instance.","user_interaction":"required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"nextcloud","vendor":"nextcloud"}],"cvss":{"score":5.7,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"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.","ecosystems":["Bitnami"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"End-to-end encryption device setup did not verify public key","id":"CVE-2021-32727","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"security_feature_bypass","year":"2021"},"n_packages":1,"n_references":4,"next":{"headline":"End-to-end encryption device setup did not verify public key","id":"CVE-2021-32728"},"packages":[{"ecosystem":"Bitnami","fixed":["3.16.1"],"introduced":["0"],"last_affected":[],"package":"nextcloud","purl":"pkg:bitnami/nextcloud","source":"BIT-nextcloud-2021-32727"}],"prev":{"headline":"Webauthn tokens not removed after user has been deleted","id":"CVE-2021-32726"},"products":["security-advisories"],"published":"2021-07-12","related":[{"cvss_score":9.8,"headline":"SQL injection in com.nextcloud.client","id":"CVE-2019-5454","kev_date_added":null,"published":"2019-07-30"},{"cvss_score":7.5,"headline":"SQL Injection in FileContentProvider (GHSL-2021-1007)","id":"CVE-2021-43863","kev_date_added":null,"published":"2022-01-25"},{"cvss_score":6.8,"headline":"Cross-site scripting in com.nextcloud.client","id":"CVE-2019-5450","kev_date_added":null,"published":"2019-07-30"},{"cvss_score":6.8,"headline":"Auth bypass in com.nextcloud.client","id":"CVE-2019-5455","kev_date_added":null,"published":"2019-07-30"},{"cvss_score":6.5,"headline":"Information disclosure in Nextcloud Android App (com.nextcloud.client)","id":"CVE-2021-22905","kev_date_added":null,"published":"2021-06-11"},{"cvss_score":6.5,"headline":"Information disclosure in Nextcloud iOS app (it.twsweb.Nextcloud)","id":"CVE-2021-22912","kev_date_added":null,"published":"2021-06-11"},{"cvss_score":6.1,"headline":"Auth bypass in Nextcloud Android","id":"CVE-2019-15615","kev_date_added":null,"published":"2020-02-04"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["nextcloud"]},"summary":"Attackers can bypass end-to-end encryption verification to access encrypted data if a malicious public key is served by the Nextcloud instance.","url":"https://insights.sbomify.com/CVE-2021-32727/"}