CVE-2021-3155

What it is

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

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-02-17 23:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:04 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 3.8 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-02-17 23:15 UTC

Last modified

2026-06-17 04:04 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-276 · Incorrect default permissions

Record status

Modified

Affected

• Canonical Snapd < 2.54.3
• Canonical Ubuntu Linux 18.04
• Canonical Ubuntu Linux 20.04
• Canonical Ubuntu Linux 21.10

Attack profile CVSS 3.1 · 3.8

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-3155.md and follow it. Check whether this project is affected by CVE-2021-3155. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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