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Vulnerability record · CVE-2021-3626 · published 1 October 2021

CVE-2021-3626: Canonical multipass improper access control vulnerability

Canonical · Multipass

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.

8.8 CVSS 3.1 High EPSS 0.25% · top 85.4% CWE-73 · CWE-73CWE-284 · Improper access control
8.8CVSS 3.1 base score, v2 4.6
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/canonical/multipass/pull/2150 PatchThird Party Advisory
https://github.com/canonical/multipass/pull/2150 PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3626), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.