CVE-2021-30465
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 10.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
- CVSS 3.1
- 8.5 HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 10.24% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linuxfoundation/runc · fedoraproject/fedora
- Source
- cve@mitre.org
EPSS moved from 10.2% on 18 October 2026 to 10.2% on 3 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- https://bugzilla.opensuse.org/show_bug.cgi?id=1185405Issue Tracking
- https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595fPatch, Third Party Advisory
- https://github.com/opencontainers/runc/releasesRelease Notes, Third Party Advisory
- https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7rPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35ZW6NBZSBH5PWIT7JU4HXOXGFVDCOHH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG4WY6TDDHV/
- https://security.gentoo.org/glsa/202107-26Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210708-0003/Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/19/2Mailing List, Third Party Advisory
- https://bugzilla.opensuse.org/show_bug.cgi?id=1185405Issue Tracking
- https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595fPatch, Third Party Advisory
- https://github.com/opencontainers/runc/releasesRelease Notes, Third Party Advisory
- https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7rPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35ZW6NBZSBH5PWIT7JU4HXOXGFVDCOHH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG4WY6TDDHV/
- https://security.gentoo.org/glsa/202107-26Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210708-0003/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.