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TI-2021-02241 Aliases CVE-2021-3155GHSA-7x7f-q6wr-wc4w

snapd created ~/snap with too-wide permissions

Priority LOW 24CWE-276Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Why it matters now

EPSS 0.0026 17th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Canonicalsnapdup to 2.54.2—No fix listedCNA
  • snapd VendorCanonical Affected up to 2.54.2 Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:canonical:snapd:*:*:*:*:*:*:*:*before 2.54.3VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*21.10VulnerableCanonical
  • cpe:2.3:a:canonical:snapd:*:*:*:*:*:*:*:* Versions before 2.54.3 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:* Versions 21.10 Vulnerable ·Canonical

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3155
  2. 2026-10-03 Alias added: GHSA-7x7f-q6wr-wc4w

References

Patch 3

  • TI-2023-01437 Injection in Canonical snapd CVSS 3.1CRITICAL 10.0
  • TI-2019-05192 Local privilege escalation via snapd socket CVSS 3.1CRITICAL 9.8
  • TI-2024-01603 snapd allows $HOME/bin symlink CVSS 3.1HIGH 8.2
  • TI-2024-04773 Improper input validation in Canonical snapd CVSS 3.1HIGH 8.1
  • TI-2020-16634 Improper privilege management in Canonical snapd CVSS 3.1CRITICAL 9.3
  • TI-2019-05191 Snapd seccomp filter TIOCSTI ioctl bypass CVSS 3.1HIGH 7.5
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences