CVE-2021-30465
HIGHCVSS 8.5/10EPSS 6.60%
Last modified
CVE-2021-30465 is a high-severity vulnerability rated 8.5/10 on the CVSS scale. 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. EPSS estimates a 6.60% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linuxfoundation | Runc | <= 0.1.1 | — |
| Linuxfoundation | Runc | 1.0.0 | Rc1 |
| Fedoraproject | Fedora | 33 | — |
| Fedoraproject | Fedora | 34 | — |
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://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://security.gentoo.org/glsa/202107-26Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210708-0003/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30465?
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.
How severe is CVE-2021-30465?
CVE-2021-30465 has a CVSS score of 8.5/10 (HIGH severity). The EPSS model estimates a 6.60% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30465?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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