Buffer overflow in Kaseya Unitrends Backup
CVE-2021-43042
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.
Vulnerability class: Buffer Overflow
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: 0.029 (86.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000
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-2021-43042?
- CVE-2021-43042 is a critical-severity vulnerability in Kaseya Unitrends Backup, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-12-06.
- How severe is CVE-2021-43042?
- Critical severity. CVSS v3 base score is 9.8 out of 10.