CVE-2020-11933: Canonical Snapd

Medium severity, CVSS 6.8. EPSS: 0.2% chance of exploitation in the next 30 days.

cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. Fixed in snapd version 2.45.2, revision 8539 and core version 2.45.2, revision 9659.

Affected products

• Canonical Snapd: before 2.45.2 (fixed in 2.45.2)
• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only

Published 2020-07-29. Last modified 2026-06-17.