What’s Vulnerable › Vulnerabilities

CVE-2021-30465

• Severity: high (CVSS 8.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 10.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-27 · updated 2026-06-17
• Weakness: CWE-362

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.

Affected products

• Fedoraproject Fedora: 33, 34
• opencontainers runc: through 0.1.1; 1.0.0-rc1, 1.0.0-rc10, 1.0.0-rc2, 1.0.0-rc3, 1.0.0-rc4, 1.0.0-rc5 (+9)

References

• http://www.openwall.com/lists/oss-security/2021/05/19/2
• http://www.openwall.com/lists/oss-security/2021/05/19/2
• http://www.openwall.com/lists/oss-security/2021/05/19/2
• http://www.openwall.com/lists/oss-security/2021/05/19/2
• https://bugzilla.opensuse.org/show_bug.cgi?id=1185405
• https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f
• https://github.com/opencontainers/runc/releases
• https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r
• 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/202107-26

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