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Fencer Vulns
critical 9.3

CVE-2020-27352 json

When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result…

published 2024-06-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19864

cvss
9.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.

Patch / fix

  • Canonical Ltd. snapd 2.48.3
  • canonical snapd 2.48.3
  • snapd Debian 14, Debian 13, Debian 12 2.49-1

debian advisories DEBIAN-CVE-2020-27352

  • snapd Ubuntu 16.04 LTS 2.48.3
  • snapd Ubuntu 18.04 LTS 2.48.3+18.04
  • snapd Ubuntu 20.04 LTS 2.48.3+20.04

ubuntu advisories UBUNTU-CVE-2020-27352

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27352 updated cvss 9.3

snapd: access restriction can be bypassed by container management snaps

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/snapd/+bug/1910456 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Canonical Ltd. snapd
  • canonical snapd

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.