CVE catalog
CVE-2021-4120
snapd: CVE-2021-4120
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 25, 2026
snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | snapd | sid | 2.77.1-2 | fixed |
| Debian | snapd | forky | 2.77.1-2 | fixed |
| Debian | snapd | trixie | 2.68.3-3+deb13u1 | fixed |
| Debian | snapd | trixie-security | 2.68.3-3+deb13u1 | fixed |
| Debian | snapd | bookworm | 2.57.6-1+deb12u1 | fixed |
| Debian | snapd | bookworm-security | 2.57.6-1+deb12u1 | fixed |
| Ubuntu | snapd | pro | 1.9 | vulnerable |
| Ubuntu | snapd | pro | 1.9.1.1 | vulnerable |
| Ubuntu | snapd | pro | 1.9.2 | vulnerable |
| Ubuntu | snapd | pro | 2.0 | vulnerable |
| Ubuntu | snapd | pro | 2.0.1 | vulnerable |
| Ubuntu | snapd | pro | 2.0.2 | vulnerable |
| Ubuntu | snapd | pro | 2.0.3 | vulnerable |
| Ubuntu | snapd | pro | 2.0.5 | vulnerable |
| Ubuntu | snapd | pro | 2.0.8 | vulnerable |
| Ubuntu | snapd | pro | 2.0.9 | vulnerable |
| Ubuntu | snapd | pro | 2.0.10 | vulnerable |
| Ubuntu | snapd | pro | 2.11+0.16.04 | vulnerable |
| Ubuntu | snapd | pro | 2.12+0.16.04 | vulnerable |
| Ubuntu | snapd | pro | 2.13 | vulnerable |
| Ubuntu | snapd | pro | 2.14.2~16.04 | vulnerable |
| Ubuntu | snapd | pro | 2.15.2ubuntu1 | vulnerable |
| Ubuntu | snapd | pro | 2.16ubuntu3 | vulnerable |
| Ubuntu | snapd | pro | 2.17.1ubuntu1 | vulnerable |
| Ubuntu | snapd | pro | 2.20.1ubuntu1 | vulnerable |
| Ubuntu | snapd | pro | 2.21 | vulnerable |
| Ubuntu | snapd | pro | 2.22.2 | vulnerable |
| Ubuntu | snapd | pro | 2.22.3 | vulnerable |
| Ubuntu | snapd | pro | 2.22.6 | vulnerable |
| Ubuntu | snapd | pro | 2.23.1 | vulnerable |
| Ubuntu | snapd | pro | 2.24.1 | vulnerable |
| Ubuntu | snapd | pro | 2.25 | vulnerable |
| Ubuntu | snapd | pro | 2.26.10 | vulnerable |
| Ubuntu | snapd | pro | 2.27.5 | vulnerable |
| Ubuntu | snapd | pro | 2.28.5 | vulnerable |
| Ubuntu | snapd | pro | 2.29.4.2 | vulnerable |
| Ubuntu | snapd | pro | 2.32.3.2 | vulnerable |
| Ubuntu | snapd | pro | 2.32.9 | vulnerable |
| Ubuntu | snapd | pro | 2.33.1ubuntu2 | vulnerable |
| Ubuntu | snapd | pro | 2.34.2 | vulnerable |
| Ubuntu | snapd | pro | 2.34.2ubuntu0.1 | vulnerable |
| Ubuntu | snapd | pro | 2.37.4 | vulnerable |
| Ubuntu | snapd | pro | 2.37.4ubuntu0.1 | vulnerable |
| Ubuntu | snapd | pro | 2.38 | vulnerable |
| Ubuntu | snapd | pro | 2.39.2 | vulnerable |
| Ubuntu | snapd | pro | 2.39.2ubuntu0.2 | vulnerable |
| Ubuntu | snapd | pro | 2.40 | vulnerable |
| Ubuntu | snapd | pro | 2.42.1 | vulnerable |
| Ubuntu | snapd | pro | 2.45.1 | vulnerable |
| Ubuntu | snapd | pro | 2.45.1ubuntu0.2 | vulnerable |
| Ubuntu | snapd | pro | 2.46.1 | vulnerable |
| Ubuntu | snapd | pro | 2.47.1 | vulnerable |
| Ubuntu | snapd | pro | 2.48 | vulnerable |
| Ubuntu | snapd | pro | 2.48.3 | vulnerable |
| Ubuntu | snapd | pro | 2.54.3+16.04~esm2 | fixed |
| Ubuntu | snapd | 18.04 | 2.28.5+17.10 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.29.4.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.29.4.2+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.31.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32+18.04~pre5 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32+18.04~pre6 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32.3.2+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32.5+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32.8+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.32.9+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.33.1+18.04ubuntu2 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.34.2+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.34.2+18.04.1 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.37.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.37.1.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.37.4+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.37.4+18.04.1 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.38+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.39.2+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.40+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.42.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.45.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.45.1+18.04.2 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.46.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.47.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.48+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.48.3+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.49.2+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.51.1+18.04 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.54.2+18.04ubuntu1 | vulnerable |
| Ubuntu | snapd | 18.04 | 2.54.3+18.04 | fixed |
| Ubuntu | snapd | 20.04 | 2.41+19.10.1 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.42.1+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.43.3+git1.8109f8 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.44~pre1+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.44+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.44.2+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.44.3+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.45.1+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.45.1+20.04.2 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.46.1+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.47.1+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.48+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.48.3+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.49.2+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.51.1+20.04ubuntu2 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.54.2+20.04ubuntu2 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.54.3+20.04 | vulnerable |
| Ubuntu | snapd | 20.04 | 2.54.3+20.04.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | snapd | source | sid | 2.54.3-1 | not yet assigned | Not reported | Not reported |
| Debian | snapd | source | forky | 2.54.3-1 | not yet assigned | Not reported | Not reported |
| Debian | snapd | source | trixie | 2.54.3-1 | not yet assigned | Not reported | Not reported |
| Debian | snapd | source | bookworm | 2.54.3-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | snapd | deb | pro | 2.54.3+16.04~esm2 | Not reported | UBUNTU-CVE-2021-4120 | Not reported |
| Ubuntu | snapd | deb | 18.04 | 2.54.3+18.04 | Not reported | UBUNTU-CVE-2021-4120 | Not reported |
| Ubuntu | snapd | deb | 20.04 | 2.54.3+20.04.1 | Not reported | UBUNTU-CVE-2021-4120 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [golang-github-snapcore-snapd-dev]Unknown
Source package: [snapd]
Details (4)
2.57.6-1+deb12u1· all · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· all · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· all · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· all · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
- [snap-confine]Unknown
Source package: [snapd]
Details (4)
2.57.6-1+deb12u1+b2· amd64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1+b2· arm64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
- [snapd]Unknown
Details (4)
2.57.6-1+deb12u1+b2· amd64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1+b2· arm64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
- [ubuntu-core-launcher]Unknown
Source package: [snapd]
Details (4)
2.57.6-1+deb12u1+b2· amd64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1+b2· arm64 · bookwormFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· amd64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
2.57.6-1+deb12u1· arm64 · bookworm-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · bookworm; dsa · snapd · debian · 12
[Debian 13 (Trixie)]
- [golang-github-snapcore-snapd-dev]Unknown
Source package: [snapd]
Details (4)
2.68.3-3+deb13u1· all · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· all · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· all · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· all · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
- [snap-confine]Unknown
Source package: [snapd]
Details (4)
2.68.3-3+deb13u1+b6· amd64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1+b6· arm64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
- [snapd]Unknown
Details (4)
2.68.3-3+deb13u1+b6· amd64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1+b6· arm64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
- [ubuntu-core-launcher]Unknown
Source package: [snapd]
Details (4)
2.68.3-3+deb13u1+b6· amd64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1+b6· arm64 · trixieFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
2.68.3-3+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.54.3-1dsa · snapd · debian · 13
Observed: