Security readout for executives and security teams
Plain-English summary
This flaw affects snapd’s generated systemd service units for the docker snap and similar snaps. During system unit reloads, container processes may be moved into the main snap daemon’s cgroup, potentially giving a container more privileges than intended.
Executive priority
Treat as high-priority where snapd-managed containers run production or sensitive workloads. The issue can weaken container isolation assumptions, but urgency should be scoped to confirmed snapd and docker-snap exposure.
Technical view
snapd omitted Delegate=yes when generating relevant systemd units. Without delegation, systemd can reassign managed container processes to the snap daemon cgroup during reloads. The CVE maps to CWE-269 and is scored CVSS 9.3 with local, low-complexity impact across confidentiality, integrity, and availability.
Likely exposure
Exposure is most relevant to systems using Canonical snapd with the docker snap or similar snaps that create and manage containers. The source bundle does not provide precise affected version ranges beyond the snapd package reference.
Exploitation context
The source bundle does not show KEV listing or other evidence of active exploitation. The weakness is local and container-related: risk depends on whether affected snap-managed container services are present and how privilege boundaries are relied upon.
Researcher notes
Evidence supports a privilege management flaw in snapd-generated systemd units. Version and fix details are incomplete in the provided bundle, so validation should rely on Canonical’s advisory and package metadata rather than assumed vulnerable ranges.
Mitigation direction
- Review Canonical USN-4728-1 and apply vendor-recommended snapd updates.
- Inventory hosts using snapd with docker or similar container-managing snaps.
- Prioritize systems where containers handle sensitive workloads or untrusted code.
- Check vendor guidance before applying compensating controls or configuration changes.
Validation and detection
- Confirm whether snapd is installed on in-scope Linux hosts.
- Identify snap-managed docker or similar container services.
- Review generated systemd units for vendor-documented corrected behavior.
- Verify remediation status against Canonical USN-4728-1.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-269: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-27352 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H2.56Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.launchpad.net/snapd/+bug/1910456CVE reference · issue-tracking
- https://ubuntu.com/security/notices/USN-4728-1CVE reference · vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-27352CVE reference · issue-tracking
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Privilege Management
Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.