{"cve":"CVE-2021-41103","nvd":{"published":"2021-10-04T17:15:08.517","modified":"2026-06-17T04:07:52.820","status":"Modified","description":"containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-22"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf","https://github.com/containerd/containerd/commit/5b46e404f6b9f661a205e28d59c982d3634148f8","https://github.com/containerd/containerd/security/advisories/GHSA-c2h3-6mxw-7mvq","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/"],"products":["debian:debian_linux","fedoraproject:fedora","linuxfoundation:containerd"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-41103","score":0.00518,"percentile":0.44093,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c2h3-6mxw-7mvq","url":"https://osv.dev/vulnerability/GHSA-c2h3-6mxw-7mvq","summary":"Insufficiently restricted permissions on plugin directories","modified":"2026-09-10T03:49:09.150508655Z","packages":[{"ecosystem":"Go","name":"github.com/containerd/containerd","purl":"pkg:golang/github.com/containerd/containerd","ranges":["<1.4.11"],"fixed":["1.4.11"]},{"ecosystem":"Go","name":"github.com/containerd/containerd","purl":"pkg:golang/github.com/containerd/containerd","ranges":[">=1.5.0 <1.5.7"],"fixed":["1.5.7"]}]},{"id":"GO-2022-0938","url":"https://osv.dev/vulnerability/GO-2022-0938","summary":"Insufficiently restricted permissions on plugin directories in github.com/containerd/containerd","modified":"2026-02-04T04:06:45.244751Z","packages":[{"ecosystem":"Go","name":"github.com/containerd/containerd","purl":"pkg:golang/github.com/containerd/containerd","ranges":["<1.4.11",">=1.5.0 <1.5.7"],"fixed":["1.4.11","1.5.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}