What’s Vulnerable › Vulnerabilities

CVE-2020-8173

• Severity: low (CVSS 2.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-02 · updated 2026-06-17
• Weakness: CWE-310

Description

A too small set of random characters being used for encryption in Nextcloud Server 18.0.4 allowed decryption in shorter time than intended.

Affected products

• Nextcloud Server: before 17.0.7; from 18.0.0 before 18.0.5 — fixed in 17.0.7, 18.0.5

How to fix

Upgrade to a fixed version: Nextcloud Server 17.0.7, 18.0.5. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/852841
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-023
• https://hackerone.com/reports/852841
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-023

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