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TI-2021-19108 Aliases CVE-2021-43042GHSA-8xcf-7jjj-p7rh

An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5.

Priority MEDIUM 47CWE-120Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.0299 87th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kaseya:unitrends_backup:*:*:*:*:*:*:*:*10.0 to before 10.5.5VulnerableKaseya
  • cpe:2.3:a:kaseya:unitrends_backup:*:*:*:*:*:*:*:* Versions 10.0 to before 10.5.5 Vulnerable ·Kaseya

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43042
  2. 2026-10-03 Alias added: GHSA-8xcf-7jjj-p7rh

References

Exploit 2

Advisory 1

  • TI-2017-09213 It was discovered that the api/storage web interface in Unitrends Backup (UB) before… CVSS 3.1CRITICAL 9.8
  • TI-2017-09212 It was discovered that the bpserverd proprietary protocol in Unitrends Backup (UB) before… CVSS 3.1CRITICAL 9.8
  • TI-2018-04653 It was discovered that the Unitrends Backup (UB) before 10.1.0 user interface was exposed… CVSS 3.0CRITICAL 9.8
  • TI-2017-09214 It was discovered that an issue in the session logic in Unitrends Backup (UB) before… CVSS 3.0HIGH 8.8
  • TI-2021-19099 An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. CVSS 3.1CRITICAL 9.8
  • TI-2021-19101 An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. CVSS 3.1CRITICAL 9.8
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences