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CVE-2020-8289

HIGH
7.8
CVSS Score
Published: December 27, 2020 at 01:20 AM UTC
Updated: June 17, 2026 at 03:26 AM UTC
1 product affected across 1 vendorBackblaze

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Severity
HIGH7.8
Exploit prediction
EPSS 5%

Description

Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Backblaze· Backblaze
95%
v < 7.0.1.433v < 7.0.1.434
Affected range stops below 7.0.1.433, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.1.434, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

Mailing Listx_refsource_FULLDISCThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2020/Dec/57
Mailing Listx_refsource_FULLDISCThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2020/Dec/58
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/geffner/CVE-2020-8289/blob/master/README.md
x_refsource_MISCPermissions Required
Source: [email protected]
https://hackerone.com/reports/818853
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://youtu.be/W0THXbcX5V8

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

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