CVE-2021-43040
HIGH
8.8
CVSS Score
Published: December 6, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 04:10 AM UTC
1 product affected across 1 vendorUnitrends Backup
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Severity
HIGH8.8
Exploit prediction
EPSS 2%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
10.0 ≤ v < 10.5.5
Affected range stops below 10.5.5, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (3)
ExploitThird Party Advisory
Source: [email protected]
https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1ExploitThird Party Advisory
Source: [email protected]
https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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