CVE-2020-8290

Name: CVE-2020-8290
Creator: NVD / NIST
Published: 2020-12-27T02:15:14.573+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2020-8290 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in `bztransmit` helper due to lack of permission handling and validation before creation of client update directories allowing for local escalation of privilege via rogue client update binary.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

Backblaze for Windows and Backblaze for macOS before 7.0.0.439 suffer from improper privilege management in `bztransmit` helper due to lack of permission handling and validation before creation of client update directories allowing for local escalation of privilege via rogue client update binary.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.58%

43.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Backblaze	Backblaze	< 7.0.0.439

References

https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818857Permissions Required
https://youtu.be/OpC6neWd2aMExploit, Third Party Advisory
https://github.com/geffner/CVE-2020-8290/blob/master/README.mdExploit, Third Party Advisory
https://hackerone.com/reports/818857Permissions Required
https://youtu.be/OpC6neWd2aMExploit, Third Party Advisory

Timeline

Published: Dec 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8290?

How severe is CVE-2020-8290?

CVE-2020-8290 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8290?

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-2020-8290?

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

Scan your code now

Source: NVD / NIST