CVE-2020-11933 json
local snapd exploit through cloud-init
published 2020-07-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4270
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Canonical snapd 2.45.2, revision 8539
- Canonical core 2.45.2, revision 9659
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 6.8 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Canonical snapd
- Canonical core
Classification
- Weakness
-
- CWE-264 Permissions, Privileges, and Access Controls
References
-
ubuntu.com
/USN-4424-1
vendor-advisory
-
launchpad.net
/bugs/1879530
third-party-advisory
Sources
- CVE List CVE-2020-11933
- NVD CVE-2020-11933
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