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CVE-2020-8289Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in…
- 7.8HighCVSS base score
- 4.7%Exploitation in 30 daysEPSS · top 8.1% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By hackerone
- 11 months later
· 11 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 4.7% · top 8.1% of all CVEs (14 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
Backblaze
- affected Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434
References
References6
- https://hackerone.com/reports/818853 (opens in a new tab)x_refsource_MISCx_transferred
- https://youtu.be/W0THXbcX5V8 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/geffner/CVE-2020-8289/blob/master/README.md (opens in a new tab)x_refsource_MISCx_transferred
- https://www.backblaze.com/blog/backblaze-cloud-backup-release-7-0-1/ (opens in a new tab)x_refsource_MISCx_transferred
- 20201229 Re: [FD] CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20201229 Re: CVE-2020-8150 - Remote Code Execution as SYSTEM/root via Backblaze (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-29157 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-8289)Record last updated .