CVE-2020-8133

Name: CVE-2020-8133
Creator: NVD / NIST
Published: 2020-11-09T15:15:13.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2020-8133 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A wrong generation of the passphrase for the encrypted block in Nextcloud Server 19.0.1 allowed an attacker to overwrite blocks in a file.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

A wrong generation of the passphrase for the encrypted block in Nextcloud Server 19.0.1 allowed an attacker to overwrite blocks in a file.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.72%

49.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	19.0.1

References

https://hackerone.com/reports/661051%2C
https://nextcloud.com/security/advisory/?id=NC-SA-2020-038Broken Link
https://hackerone.com/reports/661051Exploit, Third Party Advisory
https://hackerone.com/reports/661051%2C
https://nextcloud.com/security/advisory/?id=NC-SA-2020-038Broken Link

Timeline

Published: Nov 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8133?

A wrong generation of the passphrase for the encrypted block in Nextcloud Server 19.0.1 allowed an attacker to overwrite blocks in a file.

How severe is CVE-2020-8133?

CVE-2020-8133 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8133?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8133?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST