Is CVE-2021-32802 in the CISA KEV catalog?

No. CVE-2021-32802 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-32802?

CVE-2021-32802 has a CVSS v3 base score of 9.3 (CRITICAL).

What is the EPSS score for CVE-2021-32802?

CVE-2021-32802 has an EPSS score of 2.52% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-32802?

Upgrade nextcloud server to 22.1.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-32802

CRITICALEPSS 83th pctl

9.3

CVSS v3

NVD

Description

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`.

CWE-829

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 22.0.0, < 22.1.0Fixed in:22.1.0CVE-2021-32802derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Exploit Intelligence

2.52%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Vendor Advisory1

docs.nextcloud.com

Mitigation1

github.com

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.