CVE-2021-30465

HIGHNVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under NVD CVSS v3. EPSS exploit probability: 6.6%, top 7% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 7%CVSS: 8.5Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
8.5
EG Score
8.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity85% × 45%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
93.1%
KEV
Not listed

Published

May 27, 2021

Last Modified

November 21, 2024

References (22)

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturunc (1.0.0~rc93-0ubuntu1.1) @ hirsute2026-05-23ubuntu
ubunturunc (1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2) @ xenial2026-05-23ubuntu
redhatcontainer-tools:rhel8-8040020210608072148.c0c392d52021-06-10redhat
redhatcontainer-tools:3.0-8040020210608070614.c0c392d52021-06-10redhat
redhatrunc-0:1.0.0-69.rc10.el7_92021-06-09redhat
redhatcontainer-tools:2.0-8020020210525070123.28c387602021-06-08redhat
redhatcontainer-tools:2.0-8040020210519150700.c0c392d52021-06-08redhat
redhatdocker-2:1.13.1-206.git7d71120.el7_92021-05-31redhat
redhatrunc-0:1.0.0-87.rhaos4.6.git23384e2.el72021-05-26redhat
redhatrunc-0:1.0.0-74.rhaos4.5.gitd2c3b70.el72021-05-26redhat
redhatrunc-0:1.0.0-96.rhaos4.8.gitcd80260.el72021-05-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/opencontainers/runc—1.0.0-rc95—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(12)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-23 02:00 UTCEG score recompute
  2. 2026-07-22 22:47 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-30465?
CVE-2021-30465 is a high vulnerability published on May 27, 2021. 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.
When was CVE-2021-30465 disclosed?
CVE-2021-30465 was first published in the National Vulnerability Database on May 27, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-30465 actively exploited?
CVE-2021-30465 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-30465?
CVE-2021-30465 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2021-30465?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30465, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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