What’s Vulnerable › Vulnerabilities

CVE-2021-3155: snapd created ~/snap with too-wide permissions

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-02-17 · updated 2026-06-17
• Weakness: CWE-276

Description

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

Affected products

• Canonical Ltd. snapd: before 2.54.3 — fixed in 2.54.3
• Canonical Ubuntu Linux: 18.04, 20.04, 21.10

How to fix

Upgrade to a fixed version: Canonical Ltd. snapd 2.54.3. Check the vendor advisory for mitigations.

References

• https://github.com/snapcore/snapd/commit/6bcaeeccd16ed8298a301dd92f6907f88c24cc85
• https://github.com/snapcore/snapd/commit/7d2a966620002149891446a53cf114804808dcca
• https://ubuntu.com/security/notices/USN-5292-1
• https://github.com/snapcore/snapd/commit/6bcaeeccd16ed8298a301dd92f6907f88c24cc85
• https://github.com/snapcore/snapd/commit/7d2a966620002149891446a53cf114804808dcca
• https://ubuntu.com/security/notices/USN-5292-1

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