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If the affected containers have different security contexts, this may allow sensitive information to be unintentionally shared. If you are not using containerd's CRI implementation (through one of the mechanisms described above), you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image which have different environment variables, you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image in rapid succession, you have reduced likelihood of being vulnerable to this issue This vulnerability has been fixed in containerd 1.3.10 and containerd 1.4.4. Users should update to these versions.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21334.json","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-21334.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21334","reference_id":"","reference_type":"","scores":[{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.614","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.6138","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61397","published_at":"2026-06-07T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.6141","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61404","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61356","published_at":"2026-06-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21334"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21334","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21334"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9c30eaa8e","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/commit/05f951a3781f4f2c1911b05e61c160e9c30eaa8e"},{"reference_url":"https://github.com/containerd/containerd/commit/2d9c8aa4b3f4313982c5c999af57212a1c5d144b","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/commit/2d9c8aa4b3f4313982c5c999af57212a1c5d144b"},{"reference_url":"https://github.com/containerd/containerd/commit/cbcb2f57fbe221986f96b552855eb802f63193de","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/commit/cbcb2f57fbe221986f96b552855eb802f63193de"},{"reference_url":"https://github.com/containerd/containerd/releases/tag/v1.3.10","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/releases/tag/v1.3.10"},{"reference_url":"https://github.com/containerd/containerd/releases/tag/v1.4.4","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/releases/tag/v1.4.4"},{"reference_url":"https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/containerd/security/advisories/GHSA-6g2q-w5j3-fwh4"},{"reference_url":"https://github.com/containerd/cri/pull/1628","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/cri/pull/1628"},{"reference_url":"https://github.com/containerd/cri/pull/1629","reference_id":"","reference_type":"","scores":[{"value":"6.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/containerd/cri/pull/1629"},{"reference_url":"https://li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