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High severity · published Dec 6, 2021
CVE-2021-43040
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5
8.8
CVSS
1.8%
EPSS
No
On KEV
Description
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The privileged vaultServer could be leveraged to create arbitrary writable files, leading to privilege escalation.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UB
Unitrends Backup · Kaseya
10.0 before 10.5.5 · source: NVD
Affected product
UB
Unitrends Backup
Kaseya
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43040
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43040
Vendor Advisory
https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961
Exploit
https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1
Exploit
https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2
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