CVE-2021-43039
MEDIUMCVSS 6.5/10EPSS 1.22%
Last modified
CVE-2021-43039 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The Samba file sharing service allowed anonymous read/write access.. EPSS estimates a 1.22% chance of exploitation in the next 30 days.
Description
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The Samba file sharing service allowed anonymous read/write access.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Kaseya | Unitrends Backup | >= 10.0, < 10.5.5 |
References
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961Vendor Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1Exploit, Third Party Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2Exploit, Third Party Advisory
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961Vendor Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1Exploit, Third Party Advisory
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-43039?
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The Samba file sharing service allowed anonymous read/write access.
How severe is CVE-2021-43039?
CVE-2021-43039 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.22% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43039?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
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- CVE-2021-43036An issue was discovered in Kaseya Unitrends Backup Appliance…9.8
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- CVE-2021-43038An issue was discovered in Kaseya Unitrends Backup Appliance…8.8
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- CVE-2021-43040An issue was discovered in Kaseya Unitrends Backup Appliance…8.8
- CVE-2021-43041An issue was discovered in Kaseya Unitrends Backup Appliance…8.8
- CVE-2021-43042An issue was discovered in Kaseya Unitrends Backup Appliance…9.8
- CVE-2021-43043An issue was discovered in Kaseya Unitrends Backup Appliance…6.5
- CVE-2021-43044An issue was discovered in Kaseya Unitrends Backup Appliance…9.8
Are you affected by CVE-2021-43039?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST