CVE-2021-32802: Preview generation used third-party library not suited for user-generated content in Nextcloud server
nextcloud · security-advisories
Vendor fix available · Affected: nextcloud security-advisories · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 85% of scored CVEs
DescriptionCVE.org
Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn't suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- nextcloud · security-advisories< 20.0.12; >= 21.0.0, < 21.0.4; >= 22.0.0, < 22.1.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- nextcloud
- Published
- September 2021
- Bounty reports
- 1 disclosed on HackerOne
Disclosed bug bounty reports about CVE-2021-32802
The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.
- HEIC image preview can be used to invoke ImagickNextcloud · 2023 · critical severityValid
CoverageNo articles yet
No CyberSIXT article names CVE-2021-32802 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.