Windows version of Multipass unauthenticated localhost tcp control socket can perform mounts
Priority LOW 38CWE-284Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.
Summary
The Windows version of Multipass before 1.7.0 allowed any local process to connect to the localhost TCP control socket to perform mounts from the operating system to a guest, allowing for privilege escalation.
Why it matters now
EPSS 0.00249 16th percentileScored 2026-11-07
Fix Fixed Multipass (Canonical): 1.7.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Canonical | Multipass | before 1.7.0 | 1.7.0 | Patch available | CNA |
- Multipass VendorCanonical Affected before 1.7.0 Fixed in 1.7.0 Patch available CNA
Remediation
- Fix · CNA Multipass (Canonical) Fixed in 1.7.0
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3626
- 2026-10-03 Alias added: GHSA-68wj-3pj9-r3hp
References
More Canonical Multipass vulnerabilities
- TI-2026-36438 SFTP Server VM Escape in Canonical Multipass CVSS 3.1HIGH 8.4
- TI-2025-04665 LPE on Multipass for macOS CVSS 3.1HIGH 7.8
- TI-2021-02680 MacOS version of Multipass incorrect owner for application directory CVSS 3.1HIGH 8.8
- TI-2026-36437 Local Privilege Escalation in Canonical Multipass CVSS 3.1HIGH 7.8
Sources
- CVE-2021-3626 · CVE Program
- CVE-2021-3626 · NVD
- FIRST EPSS
- GHSA-68wj-3pj9-r3hp · GitHub Advisory Database · CC BY 4.0
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