What is the CVSS score of CVE-2020-8289?

CVE-2020-8289 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 4.7%.

Is there a public PoC exploit available for CVE-2020-8289?

Yes, a public proof-of-concept exploit is available for CVE-2020-8289. Prioritise patching immediately. EPSS: 4.7%.

Backblaze CVE-2020-8289

HIGH

Improper Certificate Validation (CWE-295)

2020-12-27 support@hackerone.com

RCE Microsoft Apple Backblaze

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Dec 27, 2020 - 02:15 nvd

HIGH 7.8

DescriptionNVD

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.

AnalysisAI

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. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-295. 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 products include: Backblaze. Version information: before 7.0.1.433.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.