# CVE-2021-3155: snapd: snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions

CVE-2021-3155 is fixed in 9 products on 1 platform, first by golang-github-snapcore-snapd-dev 2.54.3+18.04, released February 17, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-3155
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 12, 2021

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-github-snapcore-snapd-dev Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [golang-github-snapcore-snapd-dev 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-snapcore-snapd-dev-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | golang-github-snapcore-snapd-dev Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [golang-github-snapcore-snapd-dev 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-snapcore-snapd-dev-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [golang-github-ubuntu-core-snappy-dev 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-ubuntu-core-snappy-dev-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [golang-github-ubuntu-core-snappy-dev 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-ubuntu-core-snappy-dev-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | snap-confine Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [snap-confine 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snap-confine-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | snap-confine Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [snap-confine 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snap-confine-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | snapd Debian 12.15 (bookworm) | 2.54-1 | [DEBIAN-CVE-2021-3155](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3155.md) | Feb 17, 2022 |
| Linux | snapd Debian 13.5 (trixie) | 2.54-1 | [DEBIAN-CVE-2021-3155](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3155.md) | Feb 17, 2022 |
| Linux | snapd Debian 14 | 2.54-1 | [DEBIAN-CVE-2021-3155](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3155.md) | Feb 17, 2022 |
| Linux | snapd Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [snapd 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snapd-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | snapd Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [snapd 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snapd-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | snapd-xdg-open Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [snapd-xdg-open 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snapd-xdg-open-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | snapd-xdg-open Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [snapd-xdg-open 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snapd-xdg-open-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | ubuntu-core-launcher Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [ubuntu-core-launcher 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-core-launcher-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | ubuntu-core-launcher Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [ubuntu-core-launcher 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-core-launcher-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | ubuntu-core-snapd-units Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [ubuntu-core-snapd-units 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-core-snapd-units-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | ubuntu-core-snapd-units Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [ubuntu-core-snapd-units 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-core-snapd-units-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | ubuntu-snappy Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [ubuntu-snappy 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-snappy-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | ubuntu-snappy Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [ubuntu-snappy 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-snappy-2.54.3-20.04.1.md) | Feb 17, 2022 |
| Linux | ubuntu-snappy-cli Ubuntu 18.04.6 LTS (bionic) | 2.54.3+18.04 | [ubuntu-snappy-cli 2.54.3+18.04](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-snappy-cli-2.54.3-18.04.md) | Feb 17, 2022 |
| Linux | ubuntu-snappy-cli Ubuntu 20.04 LTS (focal) | 2.54.3+20.04.1 | [ubuntu-snappy-cli 2.54.3+20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-snappy-cli-2.54.3-20.04.1.md) | Feb 17, 2022 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.