RCE in Kaseya Unitrends Backup
CVE-2021-43033
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. Multiple functions in the bpserverd daemon were vulnerable to arbitrary remote code execution as root. The vulnerability was caused by untrusted input (received by the server) being passed to system calls.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.062 (93.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.060 · newest: 0.062 · change: +0.002
Affected products
Weakness classification (CWE)
References
- helpdesk.kaseya.com/hc/en-gb/articles/4412762258961 (Vendor Advisory)
- www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part… (Exploit, Third Party Advisory)
- www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43033?
- CVE-2021-43033 is a critical-severity vulnerability in Kaseya Unitrends Backup, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-12-06.
- How severe is CVE-2021-43033?
- Critical severity. CVSS v3 base score is 9.8 out of 10.